"Failed to create manifest file" error when deploying nodejs app

[Hugo M]

I'm getting this error:

DEBUG: (gcloud.app.deploy) Error Response: [13] Failed to create manifest file.
Traceback (most recent call last):
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/calliope/cli.py", line 987, in Execute
    resources = calliope_command.Run(cli=self, args=args)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/calliope/backend.py", line 795, in Run
    resources = command_instance.Run(args)
  File "/some-folder/google-cloud-sdk/lib/surface/app/deploy.py", line 90, in Run
    parallel_build=False)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 624, in RunDeploy
    flex_image_build_option=flex_image_build_option)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/command_lib/app/deploy_util.py", line 422, in Deploy
    extra_config_settings)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/api_lib/app/appengine_api_client.py", line 207, in DeployService
    poller=done_poller)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/api_lib/app/operations_util.py", line 315, in WaitForOperation
    sleep_ms=retry_interval)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/api_lib/util/waiter.py", line 254, in WaitFor
    sleep_ms, _StatusUpdate)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/api_lib/util/waiter.py", line 316, in PollUntilDone
    sleep_ms=sleep_ms)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/core/util/retry.py", line 229, in RetryOnResult
    if not should_retry(result, state):
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/api_lib/util/waiter.py", line 310, in _IsNotDone
    return not poller.IsDone(operation)
  File "/some-folder/google-cloud-sdk/lib/googlecloudsdk/api_lib/app/operations_util.py", line 184, in IsDone
    encoding.MessageToPyValue(operation.error)))

This is my app.yaml file:

runtime: nodejs8
instance_class: F1

env_variables:
   # some vars

Not sure why this would happen and the error is not very explicit.

These are the versions I have in my package.json:

  "engines": {
    "node": "^8.0.0",
    "npm": "^6.0.0"
  },

[yka...@google.com]

I recommend trying to deploy the quickstart to see if you get the same error. If the issue persists and you believe this is an issue on the Google side, please open a new issue on the Issue Tracker website. You can also post this on Stackoverflow as it is better suited for technical development questions.