title: "No project ID could be determined from the Cloud SDK configuration" when running psqworker
body: <p>When I was going through the Google Cloud tutorial: <a href="https://cloud.google.com/python/getting-started/using-pub-sub#running_the_app_on_your_local_machine" rel="nofollow noreferrer">https://cloud.google.com/python/getting-started/using-pub-sub#running_the_app_on_your_local_machine</a></p>
  
  <p>I got the following error:</p>
  
  <p>google.auth._default No project ID could be determined from the Cloud SDK configuration. Consider running <code>gcloud config set project</code> or setting the GOOGLE_CLOUD_PROJECT environment variable</p>
  
  <p>I did 'gcloud config set project [my project name]' with no success.</p>
  
  <p>What's the problem?</p>
  
  <p>Update: I've deployed app engines previously without any problem. The problem only happens when I run the psqworker for this Pub/Sub function. I know my project ID and used it before.</p>