I'm using cloud app deploy but it comes:
Server responded with code [400]:
Bad Request Unexpected HTTP status 400.
Failed Project Preparation (app_id='b~eloquent-env-168317'). Out of retries. Last error: Temporary error occurred while verifying project: TEMPORARY_ERROR: Operation does not satisfy the following requirements: billing-enabled {Billing must be enabled for activation of service '' in project 'eloquent-env-168317' to proceed., https://console.developers.google.com/project/eloquent-env-168317/settings}
com.google.api.management.server.common.exceptions.ServiceManagementNonRetriableStorageException: Operation does not satisfy the following requirements: billing-enabled {Billing must be enabled for activation of service '' in project 'eloquent-env-168317' to proceed., https://console.developers.google.com/project/eloquent-env-168317/settings}
Beginning deployment of service [default]...
Building and pushing image for service [default]
Some files were skipped. Pass --verbosity=info
to see which ones.
You may also view the gcloud log file, found at
[/Users/majnun/.config/gcloud/logs/2017.05.22/01.24.54.321942.log].
ERROR: (gcloud.app.deploy) You do not have permission to access project [eloquent-env-168317] (or it may not exist): The caller does not have permission
what's wrong, how can I fix it, thanks a lot