Hi Suttiwat
In a nutshell, it seems like a temporary error on the Cloud Platform’s side. Are you still having this issue? If Yes, I would recommend to check your Google Cloud SDk version by using this[1] command. As of now, this should be [218.0.0], if it is not, please update using this command [2] and try to deploy your app again.
If it still gives the same error, I would recommend to create a bug report using issue tracker as mentioned here[3]. Before doing this, please run this [4] command and provide the output with it. This will allow us to provide more information to check detail logs regarding this error. Also please provide a time frame from when this error started for you. And finally it would be great if you can provide any reproducible steps for this issue.
[1] gcloud version
[2] gcloud components update
[3] https://cloud.google.com/support/docs/issue-trackers
[4] gcloud info --anonymize