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href=/docs/headless-js-android>Android and iOS guides</a></div><li class="theme-doc-sidebar-item-category theme-doc-sidebar-item-category-level-1 menu__list-item menu__list-item--collapsed"><div class=menu__list-item-collapsible><a class="menu__link menu__link--sublist menu__link--sublist-caret" role=button aria-expanded=false href=/docs/legacy/native-modules-intro>Legacy Architecture</a></div></ul></nav></div></div></aside><main class=docMainContainer_a9sJ><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_Qr34"><div class=docItemContainer_tjFy><article><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type=button class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Troubleshooting</h1></header><p>These are some common issues you may run into while setting up React Native. If you encounter something that is not listed here, try <a href=https://github.com/facebook/react-native/issues/ target=_blank rel="noopener noreferrer">searching for the issue in GitHub</a>.</p>
5<h3 class="anchor anchorWithStickyNavbar_JmGV" id=port-already-in-use>Port already in use<a href=#port-already-in-use class=hash-link aria-label="Direct link to Port already in use" title="Direct link to Port already in use"></a></h3>
6<p>The <a href=https://metrobundler.dev/ target=_blank rel="noopener noreferrer">Metro bundler</a> runs on port 8081. If another process is already using that port, you can either terminate that process, or change the port that the bundler uses.</p>
7<h4 class="anchor anchorWithStickyNavbar_JmGV" id=terminating-a-process-on-port-8081>Terminating a process on port 8081<a href=#terminating-a-process-on-port-8081 class=hash-link aria-label="Direct link to Terminating a process on port 8081" title="Direct link to Terminating a process on port 8081"></a></h4>
8<p>Run the following command to find the id for the process that is listening on port 8081:</p>
9<div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token function" style=color:#79b6f2>sudo</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>lsof</span><span class="token plain"> </span><span class="token parameter variable" style=color:#cb4b16>-i</span><span class="token plain"> :8081</span><br></span></code></pre></div></div>
10<p>Then run the following to terminate the process:</p>
11<div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token function" style=color:#79b6f2>kill</span><span class="token plain"> </span><span class="token parameter variable" style=color:#cb4b16>-9</span><span class="token plain"> </span><span class="token operator" style=color:#fc929e><</span><span class="token plain">PID</span><span class="token operator" style=color:#fc929e>></span><br></span></code></pre></div></div>
12<p>On Windows you can find the process using port 8081 using <a href=https://stackoverflow.com/questions/48198/how-can-you-find-out-which-process-is-listening-on-a-port-on-windows target=_blank rel="noopener noreferrer">Resource Monitor</a> and stop it using Task Manager.</p>
13<h4 class="anchor anchorWithStickyNavbar_JmGV" id=using-a-port-other-than-8081>Using a port other than 8081<a href=#using-a-port-other-than-8081 class=hash-link aria-label="Direct link to Using a port other than 8081" title="Direct link to Using a port other than 8081"></a></h4>
14<p>You can configure the bundler to use a port other than 8081 by using the <code>port</code> parameter, from the root of your project run:</p>
15<div class="tabs-container tabList_J5MA"><ul role=tablist aria-orientation=horizontal class=tabs><li role=tab tabindex=0 aria-selected=true class="tabs__item tabItem_l0OV tabs__item--active">npm<li role=tab tabindex=-1 aria-selected=false class="tabs__item tabItem_l0OV">Yarn</ul><div class=margin-top--md><div role=tabpanel class=tabItem_wHwb><div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token function" style=color:#79b6f2>npm</span><span class="token plain"> start -- </span><span class="token parameter variable" style=color:#cb4b16>--port</span><span class="token operator" style=color:#fc929e>=</span><span class="token number" style=color:#5a9bcf>8088</span><br></span></code></pre></div></div></div><div role=tabpanel class=tabItem_wHwb hidden><div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token function" style=color:#79b6f2>yarn</span><span class="token plain"> start </span><span class="token parameter variable" style=color:#cb4b16>--port</span><span class="token plain"> </span><span class="token number" style=color:#5a9bcf>8088</span><br></span></code></pre></div></div></div></div></div>
16<p>You will also need to update your applications to load the JavaScript bundle from the new port. If running on device from Xcode, you can do this by updating occurrences of <code>8081</code> to your chosen port in the <code>ios/__App_Name__.xcodeproj/project.pbxproj</code> file.</p>
17<h3 class="anchor anchorWithStickyNavbar_JmGV" id=npm-locking-error>NPM locking error<a href=#npm-locking-error class=hash-link aria-label="Direct link to NPM locking error" title="Direct link to NPM locking error"></a></h3>
18<p>If you encounter an error such as <code>npm WARN locking Error: EACCES</code> while using the React Native CLI, try running the following:</p>
19<div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token function" style=color:#79b6f2>sudo</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>chown</span><span class="token plain"> </span><span class="token parameter variable" style=color:#cb4b16>-R</span><span class="token plain"> </span><span class="token environment constant" style=color:#5a9bcf>$USER</span><span class="token plain"> ~/.npm</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token function" style=color:#79b6f2>sudo</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>chown</span><span class="token plain"> </span><span class="token parameter variable" style=color:#cb4b16>-R</span><span class="token plain"> </span><span class="token environment constant" style=color:#5a9bcf>$USER</span><span class="token plain"> /usr/local/lib/node_modules</span><br></span></code></pre></div></div>
20<h3 class="anchor anchorWithStickyNavbar_JmGV" id=missing-libraries-for-react>Missing libraries for React<a href=#missing-libraries-for-react class=hash-link aria-label="Direct link to Missing libraries for React" title="Direct link to Missing libraries for React"></a></h3>
21<p>If you added React Native manually to your project, make sure you have included all the relevant dependencies that you are using, like <code>RCTText.xcodeproj</code>, <code>RCTImage.xcodeproj</code>. Next, the binaries built by these dependencies have to be linked to your app binary. Use the <code>Linked Frameworks and Binaries</code> section in the Xcode project settings. More detailed steps are here: <a href=/docs/linking-libraries-ios#content>Linking Libraries</a>.</p>
22<p>If you are using CocoaPods, verify that you have added React along with the subspecs to the <code>Podfile</code>. For example, if you were using the <code><Text /></code>, <code><Image /></code> and <code>fetch()</code> APIs, you would need to add these in your <code>Podfile</code>:</p>
23<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token plain">pod </span><span class="token string" style=color:#8dc891>'React'</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> </span><span class="token operator" style=color:#fc929e>:</span><span class="token plain">path </span><span class="token arrow operator" style=color:#fc929e>=></span><span class="token plain"> </span><span class="token string" style=color:#8dc891>'../node_modules/react-native'</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> </span><span class="token operator" style=color:#fc929e>:</span><span class="token plain">subspecs </span><span class="token arrow operator" style=color:#fc929e>=></span><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>[</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token string" style=color:#8dc891>'RCTText'</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token string" style=color:#8dc891>'RCTImage'</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token string" style=color:#8dc891>'RCTNetwork'</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token string" style=color:#8dc891>'RCTWebSocket'</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token punctuation" style=color:#657b83>]</span><br></span></code></pre></div></div>
24<p>Next, make sure you have run <code>pod install</code> and that a <code>Pods/</code> directory has been created in your project with React installed. CocoaPods will instruct you to use the generated <code>.xcworkspace</code> file henceforth to be able to use these installed dependencies.</p>
25<h4 class="anchor anchorWithStickyNavbar_JmGV" id=react-native-does-not-compile-when-being-used-as-a-cocoapod>React Native does not compile when being used as a CocoaPod<a href=#react-native-does-not-compile-when-being-used-as-a-cocoapod class=hash-link aria-label="Direct link to React Native does not compile when being used as a CocoaPod" title="Direct link to React Native does not compile when being used as a CocoaPod"></a></h4>
26<p>There is a CocoaPods plugin called <a href=https://github.com/orta/cocoapods-fix-react-native target=_blank rel="noopener noreferrer">cocoapods-fix-react-native</a> which handles any potential post-fixing of the source code due to differences when using a dependency manager.</p>
27<h4 class="anchor anchorWithStickyNavbar_JmGV" id=argument-list-too-long-recursive-header-expansion-failed>Argument list too long: recursive header expansion failed<a href=#argument-list-too-long-recursive-header-expansion-failed class=hash-link aria-label="Direct link to Argument list too long: recursive header expansion failed" title="Direct link to Argument list too long: recursive header expansion failed"></a></h4>
28<p>In the project's build settings, <code>User Search Header Paths</code> and <code>Header Search Paths</code> are two configs that specify where Xcode should look for <code>#import</code> header files specified in the code. For Pods, CocoaPods uses a default array of specific folders to look in. Verify that this particular config is not overwritten, and that none of the folders configured are too large. If one of the folders is a large folder, Xcode will attempt to recursively search the entire directory and throw above error at some point.</p>
29<p>To revert the <code>User Search Header Paths</code> and <code>Header Search Paths</code> build settings to their defaults set by CocoaPods - select the entry in the Build Settings panel, and hit delete. It will remove the custom override and return to the CocoaPod defaults.</p>
30<h3 class="anchor anchorWithStickyNavbar_JmGV" id=no-transports-available>No transports available<a href=#no-transports-available class=hash-link aria-label="Direct link to No transports available" title="Direct link to No transports available"></a></h3>
31<p>React Native implements a polyfill for WebSockets. These <a href=https://github.com/facebook/react-native/blob/main/packages/react-native/Libraries/Core/InitializeCore.js target=_blank rel="noopener noreferrer">polyfills</a> are initialized as part of the react-native module that you include in your application through <code>import React from 'react'</code>. If you load another module that requires WebSockets, such as <a href=https://github.com/facebook/react-native/issues/3645 target=_blank rel="noopener noreferrer">Firebase</a>, be sure to load/require it after react-native:</p>
32<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token keyword" style=color:#c5a5c5>import</span><span class="token plain"> </span><span class="token imports maybe-class-name">React</span><span class="token plain"> </span><span class="token keyword" style=color:#c5a5c5>from</span><span class="token plain"> </span><span class="token string" style=color:#8dc891>'react'</span><span class="token punctuation" style=color:#657b83>;</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"></span><span class="token keyword" style=color:#c5a5c5>import</span><span class="token plain"> </span><span class="token imports maybe-class-name">Firebase</span><span class="token plain"> </span><span class="token keyword" style=color:#c5a5c5>from</span><span class="token plain"> </span><span class="token string" style=color:#8dc891>'firebase'</span><span class="token punctuation" style=color:#657b83>;</span><br></span></code></pre></div></div>
33<h2 class="anchor anchorWithStickyNavbar_JmGV" id=shell-command-unresponsive-exception>Shell Command Unresponsive Exception<a href=#shell-command-unresponsive-exception class=hash-link aria-label="Direct link to Shell Command Unresponsive Exception" title="Direct link to Shell Command Unresponsive Exception"></a></h2>
34<p>If you encounter a ShellCommandUnresponsiveException exception such as:</p>
35<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token maybe-class-name">Execution</span><span class="token plain"> failed </span><span class="token keyword" style=color:#c5a5c5>for</span><span class="token plain"> task </span><span class="token string" style=color:#8dc891>':app:installDebug'</span><span class="token punctuation" style=color:#657b83>.</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token property-access">com</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access">android</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access">builder</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access">testing</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access">api</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access maybe-class-name">DeviceException</span><span class="token operator" style=color:#fc929e>:</span><span class="token plain"> com</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access">android</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access">ddmlib</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access maybe-class-name">ShellCommandUnresponsiveException</span><br></span></code></pre></div></div>
36<p>Try <a href=https://github.com/facebook/react-native/issues/2720 target=_blank rel="noopener noreferrer">downgrading your Gradle version to 1.2.3</a> in <code>android/build.gradle</code>.</p>
37<h2 class="anchor anchorWithStickyNavbar_JmGV" id=react-native-init-hangs>react-native init hangs<a href=#react-native-init-hangs class=hash-link aria-label="Direct link to react-native init hangs" title="Direct link to react-native init hangs"></a></h2>
38<p>If you run into issues where running <code>npx react-native init</code> hangs in your system, try running it again in verbose mode and referring to <a href=https://github.com/facebook/react-native/issues/2797 target=_blank rel="noopener noreferrer">#2797</a> for common causes:</p>
39<div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token plain">npx react-native init </span><span class="token parameter variable" style=color:#cb4b16>--verbose</span><br></span></code></pre></div></div>
40<p>When you're debugging a process or need to know a little more about the error being thrown, you may want to use the verbose option to output more logs and information to nail down your issue.</p>
41<p>Run the following command in your project's root directory.</p>
42<div class="tabs-container tabList_J5MA"><ul role=tablist aria-orientation=horizontal class=tabs><li role=tab tabindex=0 aria-selected=true class="tabs__item tabItem_l0OV tabs__item--active">npm<li role=tab tabindex=-1 aria-selected=false class="tabs__item tabItem_l0OV">Yarn</ul><div class=margin-top--md><div role=tabpanel class=tabItem_wHwb><div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token function" style=color:#79b6f2>npm</span><span class="token plain"> run android -- </span><span class="token parameter variable" style=color:#cb4b16>--verbose</span><br></span></code></pre></div></div></div><div role=tabpanel class=tabItem_wHwb hidden><div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token function" style=color:#79b6f2>yarn</span><span class="token plain"> android </span><span class="token parameter variable" style=color:#cb4b16>--verbose</span><br></span></code></pre></div></div></div></div></div>
43<h2 class="anchor anchorWithStickyNavbar_JmGV" id=unable-to-start-react-native-package-manager-on-linux>Unable to start react-native package manager (on Linux)<a href=#unable-to-start-react-native-package-manager-on-linux class=hash-link aria-label="Direct link to Unable to start react-native package manager (on Linux)" title="Direct link to Unable to start react-native package manager (on Linux)"></a></h2>
44<h3 class="anchor anchorWithStickyNavbar_JmGV" id=case-1-error-codeenospcerrnoenospc>Case 1: Error "code":"ENOSPC","errno":"ENOSPC"<a href=#case-1-error-codeenospcerrnoenospc class=hash-link aria-label='Direct link to Case 1: Error "code":"ENOSPC","errno":"ENOSPC"' title='Direct link to Case 1: Error "code":"ENOSPC","errno":"ENOSPC"'></a></h3>
45<p>Issue caused by the number of directories <a href=https://github.com/guard/listen/blob/master/README.md#increasing-the-amount-of-inotify-watchers target=_blank rel="noopener noreferrer">inotify</a> (used by watchman on Linux) can monitor. To solve it, run this command in your terminal window</p>
46<div class="language-shell codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>shell</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-shell codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token builtin class-name" style=color:#fac863>echo</span><span class="token plain"> </span><span class="token assign-left variable" style=color:#cb4b16>fs.inotify.max_user_watches</span><span class="token operator" style=color:#fc929e>=</span><span class="token number" style=color:#5a9bcf>582222</span><span class="token plain"> </span><span class="token operator" style=color:#fc929e>|</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>sudo</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>tee</span><span class="token plain"> </span><span class="token parameter variable" style=color:#cb4b16>-a</span><span class="token plain"> /etc/sysctl.conf </span><span class="token operator" style=color:#fc929e>&&</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>sudo</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>sysctl</span><span class="token plain"> </span><span class="token parameter variable" style=color:#cb4b16>-p</span><br></span></code></pre></div></div>
47<h3 class="anchor anchorWithStickyNavbar_JmGV" id=error-spawnsync-gradlew-eacces>Error: spawnSync ./gradlew EACCES<a href=#error-spawnsync-gradlew-eacces class=hash-link aria-label="Direct link to Error: spawnSync ./gradlew EACCES" title="Direct link to Error: spawnSync ./gradlew EACCES"></a></h3>
48<p>If you run into issue where executing <code>npm run android</code> or <code>yarn android</code> on macOS throws the above error, try to run <code>sudo chmod +x android/gradlew</code> command to make <code>gradlew</code> files into executable.</div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class=editButtons_t0bR><a href=https://github.com/facebook/react-native-website/edit/main/docs/troubleshooting.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit page for next release</a><a href=https://github.com/facebook/react-native-website/edit/main/website/versioned_docs/version-0.79/troubleshooting.md target=_blank rel="noopener noreferrer" 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