Resource level errors in Google Could Deployment Manager
Solution 1:
From the error message, it looks like you might have used a zone rather than a region when creating the VCP subnetwork. In GCP, VPC subnets are regional resources.
error - /regions/us-east1-b/subnetworks - us-east1-b is a zone, the equivalent region should be us-east1 as in /regions/us-east1/subnetworks