custom network issue

[pandusiddhu]

@benofben while using the custom network we are getting the following error. could you please helm me to resolve the issue.

message: "{"ResourceType":"compute.v1.instance","ResourceErrorCode":"400"
,"ResourceErrorMessage":{"code":400,"errors":[{"domain":"global","
message":"Invalid value for field 'resource.networkInterfaces[0]': ''. Subnetwork
\ should be specified for custom subnetmode network","reason":"invalid"}],"
message":"Invalid value for field 'resource.networkInterfaces[0]': ''. Subnetwork
\ should be specified for custom subnetmode network","statusMessage":"Bad\

[benofben]

I'm no longer at DataStax, but @gmflau or @scotthds might be able to help.