title: Error: HTTP Error 400, The Request has errors. Firebase Firestore Cloud Functions
body: <p>While I run the command firebase deploy I get this error:</p>
  
  <blockquote>
    <p><p> i  deploying functions<p></p>
    
    <p>i  functions: ensuring necessary APIs are enabled...</p>
    
    <p>i  runtimeconfig: ensuring necessary APIs are enabled...</p>
    
    <p><p>✔  runtimeconfig: all necessary APIs are enabled
    <p>✔  functions: all necessary APIs are enabled
    <p>i  functions: preparing functions directory for uploading...
    <p>i  functions: packaged functions (4.04 KB) for uploading
    <p>✔  functions: functions folder uploaded successfully
    <p>i  starting release process (may take several minutes)...
    <p>i  functions: creating function followerNotification...
    <p>⚠  functions: failed to create function followerNotification
    <p>⚠  functions: HTTP Error: 400, The request has errors
    <p>⚠  functions: 1 function(s) failed to be deployed.</p>
    
    <p>Functions deploy had errors. To continue deploying other features (such as >database), run:
       firebase deploy --except functions</p>
    
    <p>Error: Functions did not deploy properly.</p>
    
    <p>Having trouble? Try firebase deploy --help</p>
  </blockquote>
  
  <p>Everything else works without problems. Only when I trying to make something with Firebase Firestore.</p>