Cannot deploy to Google Cloud App Engine

Question

I'm trying to setup the pipeline to automatically deploy a nodejs application to Google App Engine. I've set the GCP_KEY_FILE_DEV variable in the repository > Deployment > Environment "Development". The variable contains a base64 encoding of the service account file needed to authenticate. But, I keep getting the same error.  See screenshot. Any ideas? Thanks.

Igor Stoyanov · Answer

And for your case i think you should do something like this in your pipeline:

echo $GCP_KEY_FILE_DEV | base64 -d > ~/.client-secret.json

gcloud auth activate-service-account --key-file ~/.client-secret.json

Igor Stoyanov · Answer

Seems i misunderstood you. I thought problem related to pipe.
Did you use this pipe: https://bitbucket.org/atlassian/google-app-engine-deploy/src/master/ ?
If not maybe you should try?

Igor Stoyanov · Answer

So, for tests you sent request from your console with your base64 encoded file and without using pipe and you received ok response? 
Or you received an error even when trying to connect  to Google Cloud App Engine from your console?