title: Android Firebase app distribution - Service credentials file does not exist. Please check the service credentials path and try again
body: <p>I'm trying to migrate from Crashlytics Beta to Firebase App Distribution.
  CircleCi in the Middle.</p>
  
  <p>The build failes in CircleCi with the following error:</p>
  
  <blockquote>
    <ul>
    <li>What went wrong:
    Execution failed for task ':FiverrApp:appDistributionUploadRelease'.
    Service credentials file does not exist. Please check the service credentials path and try again</li>
    </ul>
  </blockquote>
  
  <p>Here is how i'm configuring serviceCredentialsFile variable
  In my build.gradle:</p>
  
  <pre><code>        release {
          buildConfigField "boolean", "FORCE_LOGS", "true"
  
          firebaseAppDistribution {
              releaseNotes="Notes\n" + getCommitMessages()
              groups="android-testers"
              serviceCredentialsFile="/api-project-xxx-yyy.json"
          }
      }
  </code></pre>
  
  <p>the file api-project-xxx-yyy.json is in the same folder with build.gradle file.
  I've also tried:</p>
  
  <pre><code>serviceCredentialsFile="api-project-xxx-yyy.json"
  serviceCredentialsFile='api-project-xxx-yyy.json'
  </code></pre>
  
  <p>And still no luck...
  Would appreciate if someone can help me.</p>