After not deploying for a month, I tried deploying an update today, however, after the file upload was complete I received the following message:
Updating service [default]...failed.
ERROR: (gcloud.app.deploy) Error Response: [13] Error processing user code
I tried to deploy using my previously deployed code to no avail.
Running
gcloud app deploy --verbosity=debug
Shows that Updating service [default]...⠛DEBUG: Operation [apps/...] not complete. Waiting to retry.
And then repeatedly gets stuck on that step. Hope someone can help.