The database '{0}' on server '{1}' has not been successfully provisioned and cannot be mounted. Provisioning was started ...

The database '{0}' on server '{1}' has not been successfully provisioned and cannot be mounted. Provisioning was started by {2} on {3} but did not complete. You can use the  New-SPProjectDatabase command to re-create the database and then re-run the current command to mount it.