title: No matching client found for package name 'com.example.labbookingsystem'
body: <p>I was building my first application for my graduation project, using android studio based on java, and connected my project to firebase so I can save the registration data in firebase, then faced a problem regarding &quot;google-services.json&quot; file that I must download into my project, which I did along with some other lines in this directory &quot;Project-level build.gradle (/build.gradle):&quot;, following the instructions on Firebase console, after I finished all these steps I synced the project.
  that's when my app won't run any more and show me this error every time I run it:</p>
  <ul>
  <li>What went wrong: Execution failed for task ':app:processDebugGoogleServices'. &gt; No matching client found for package name 'com.example.labbookingsystem'</li>
  </ul>
  <p>Please help.</p>