title: React Native Firebase build error
body: <p>I've been struggling with getting my react native instance to run and i keep hitting this:</p>
  
  <pre><code>** BUILD FAILED **
  
  
  The following build commands failed:
      CompileC /Users/alexvallejo/Sites/myProj/ios/build/Build/Intermediates/Pods.build/Debug-iphonesimulator/RNFirebase.build/Objects-normal/x86_64/BannerComponent.o /Users/alexvallejo/Sites/myProj/node_modules/react-native-firebase/ios/RNFirebase/admob/BannerComponent.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
      CompileC /Users/alexvallejo/Sites/myProj/ios/build/Build/Intermediates/Pods.build/Debug-iphonesimulator/RNFirebase.build/Objects-normal/x86_64/NativeExpressComponent.o /Users/alexvallejo/Sites/myProj/node_modules/react-native-firebase/ios/RNFirebase/admob/NativeExpressComponent.m normal x86_64 objective-c com.apple.compilers.llvm.clang.1_0.compiler
  (2 failures)
  
  
  Installing build/Build/Products/Debug-iphonesimulator/myProj.app
  An error was encountered processing the command (domain=MIInstallerErrorDomain, code=4):
  Failed to chmod /Users/alexvallejo/Library/Developer/CoreSimulator/Devices/31C5C7FC-9DE4-4F95-A7F5-50296C8CC6CB/data/Library/Caches/com.apple.containermanagerd/Bundle/Application/0170A665-460A-4CDF-92B4-0FAC8FBE2224/myProj.app/myProj : No such file or directory
  Launching org.reactjs.native.example.myProj
  </code></pre>
  
  <p>Any ideas on what's going on here? I dont have <code>pod 'Firebase/AdMob'</code> in my Podfile so i don't know why BannerComponent is trying to load.</p>