title: Build Failing for React Native iOS, "Multiple commands produce" Error
body: <p>We were working on a react native project. One of my team members added some native modules on Linux and linked android. By then I am trying to link things in iOS but the build is always failing with this kind of error trace. The Android project is building normally.</p>
  
  <p>I deleted <code>xyz.xcworkspace</code> and <code>Podfile.lock</code> then tried <code>pod install</code>.<br>
  Also, I tried to delete my <code>node_modules</code> and then <code>yarn install</code> followed by <code>yarn link</code>.</p>
  
  <pre><code>react-native-cli: 2.0.1  
  react-native: 0.61.4  
  yarn 1.19.1
  Pod 1.8.4
  XCode Version 11.2.1 (11B500)
  macOS Catalina 10.15.1 (19B88)
  </code></pre>
  
  <hr>
  
  <p>xyz warning</p>
  
  <pre><code>duplicate output file '/Users/user/Library/Developer/Xcode/DerivedData/xyz-hhesslamjsqmbobykhskliclusph/Build/Products/Debug-iphonesimulator/xyz.app/AntDesign.ttf' on task: PhaseScriptExecution [CP] Copy Pods Resources /Users/faisal/Library/Developer/Xcode/DerivedData/xyz-hhesslamjsqmbobykhskliclusph/Build/Intermediates.noindex/xyz.build/Debug-iphonesimulator/xyz.build/Script-47F818C57EEC47EA3303EA1B.sh
  </code></pre>
  
  <p>xyz workspace errors</p>
  
  <pre><code>Multiple commands produce '/Users/user/Library/Developer/Xcode/DerivedData/xyz-hhesslamjsqmbobykhskliclusph/Build/Products/Debug-iphonesimulator/xyz.app/Zocial.ttf':
  1) Target 'xyz' (project 'xyz') has copy command from '/Users/user/Desktop/xyz/native/node_modules/react-native-vector-icons/Fonts/Zocial.ttf' to '/Users/user/Library/Developer/Xcode/DerivedData/xyz-hhesslamjsqmbobykhskliclusph/Build/Products/Debug-iphonesimulator/xyz.app/Zocial.ttf'
  2) That command depends on command in Target 'xyz' (project 'xyz'): script phase “[CP] Copy Pods Resources”
  </code></pre>
  
  <p>There are multiple errors and warnings like this but have same format with different file names.</p>