App Engine Documentation Python Exceptions The protorpc.transport package provides the following exception classes: class RpcStateError() Raised when trying to put RPC into an invalid state.. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated October 4, 2016.