Internal error during creation of App Engine via deployment manager - google-app-engine

Question

I am trying to create an App Engine service via Deployment Manager.
My deployment-manager.yaml file looks like below
imports:
- path: create-app-engine-std.py
resources:
- name: create-app-engine-std-app
type: create-app-engine-std.py
properties:
name: app-engine-std-app
appsId: projectId
zip:
sourceUrl: https://storage.googleapis.com/some-bucket/xyz.zip
filesCount: 2
version: v1
runtime: nodejs8
My create-app-engine-std.py look like below
def GenerateConfig(cxt):
deployment = {}
if cxt.properties['zip']:
deployment = {
'zip': {
'sourceUrl': cxt.properties['zip']['sourceUrl'],
'filesCount': cxt.properties['zip']['filesCount']
}
}
resources = [{
'type': 'gcp-types/appengine-v1:apps.services.versions',
'name': 'app-engine-std-app',
'properties': {
'servicesId': 'app-engine-std-test-app',
'appsId': cxt.properties['appsId'],
'deployment': deployment,
'runtime': cxt.properties['runtime'],
'threadsafe': True,
'id': cxt.properties['version']
}
}]
return {'resources': resources}
When I execute the deployment command I get following error
message: '{"ResourceType":"gcp-types/appengine-v1:apps.services.versions","ResourceErrorCode":"500","ResourceErrorMessage":"An
internal error occurred."}'
I tried using the apps.services.versions.create API but I always get following error although I am owner of the project
{
"error": {
"code": 403,
"message": "The caller does not have permission",
"status": "PERMISSION_DENIED"
}
}
Can someone guide me why I am getting the internal error and why can't I use the API. Thanks...