title: Cocoapods files are missing in flutter
body: <p>I'm not an ios developer and am trying to add Firebase to my Flutter project. I followed the firebase guideline of adding an ios project. I first moved the <code>GoogleService-Info.plist</code> into <code>Runner/Runner</code> in Xcode. Thereafter I executed <code>$pod init</code> and added <code>pod 'Firebase Core'</code> into the <code>Podfile</code>. As described in the setup guide I executed <code>pod install</code> thereafter. This command already shows the following error messages:</p>
  
  <blockquote>
    <p>[!] Automatically assigning platform <code>ios</code> with version <code>8.0</code> on target <code>Runner</code> because no platform was specified. Please specify a
    platform for this target in your Podfile. See
    <code>https://guides.cocoapods.org/syntax/podfile.html#platform</code>.</p>
    
    <p>[!] CocoaPods did not set the base configuration of your project
    because your project already has a custom config set. In order for
    CocoaPods integration to work at all, please either set the base
    configurations of the target <code>Runner</code> to <code>Pods/Target Support
    Files/Pods-Runner/Pods-Runner.debug.xcconfig</code> or include the
    <code>Pods/Target Support Files/Pods-Runner/Pods-Runner.debug.xcconfig</code> in
    your build configuration (<code>Flutter/Debug.xcconfig</code>).</p>
    
    <p>[!] CocoaPods did not set the base configuration of your project
    because your project already has a custom config set. In order for
    CocoaPods integration to work at all, please either set the base
    configurations of the target <code>Runner</code> to <code>Pods/Target Support
    Files/Pods-Runner/Pods-Runner.release.xcconfig</code> or include the
    <code>Pods/Target Support Files/Pods-Runner/Pods-Runner.release.xcconfig</code>
    in your build configuration (<code>Flutter/Release.xcconfig</code>).</p>
    
    <p>[!] CocoaPods did not set the base configuration of your project
    because your project already has a custom config set. In order for
    CocoaPods integration to work at all, please either set the base
    configurations of the target <code>Runner</code> to <code>Pods/Target Support
    Files/Pods-Runner/Pods-Runner.profile.xcconfig</code> or include the
    <code>Pods/Target Support Files/Pods-Runner/Pods-Runner.profile.xcconfig</code>
    in your build configuration (<code>Flutter/Release.xcconfig</code>).</p>
  </blockquote>
  
  <p>When I now try to run my app the <code>debug concol</code> outputs these errors:</p>
  
  <blockquote>
  <pre><code>=== BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
  diff: /Podfile.lock: No such file or directory
  diff: /Manifest.lock: No such file or directory
  error: The sandbox is not in sync with the Podfile.lock. Run 'pod install' or update your CocoaPods installation.
  </code></pre>
  </blockquote>
  
  <p>It seems as if some files are missing even though they are inside the ios project folder.</p>