title: GOOGLE_APPLICATION_CREDENTIALS error
body: <p>I am trying to use the google speech API for converting an audio file to text, but facing some problems with the documentation.I have enabled the speech API and created an service account file. I also got the service account credentials activated. Then I wrote the following command to retrieve the authorization token using my service account.</p>
  
  <p><code>gcloud auth application-default print-access-token</code></p>
  
  <p>But it is returning this message
  <a href="https://i.stack.imgur.com/ozpcr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ozpcr.png" alt="enter image description here"></a></p>
  
  <p>I don't understand why this is happening because I already have an VM instance created in my Compute Engine. Can anybody explain where am I going wrong with this? Also, is there any other way to authenticate my account and call the google speech API?</p>