Serialization policy was not found

Hi,

I cannot launch a GWT app in hosted mode with the gwt:run goal. I get a serialization error :
[INFO] StandardContext[]ERROR: The serialization policy file '/test.GMavenTest/3D8C9ED7A7ACB57FC755C1283A84575C.gwt.rpc' was not found; did you forget to include it in this deployment?
[INFO] StandardContext[]WARNING: Failed to get the SerializationPolicy '3D8C9ED7A7ACB57FC755C1283A84575C' for module 'http://localhost:8888/test.GMavenTest/'; a legacy, 1.3.3 compatible, serialization policy will be used. You may experience SerializationExceptions as a result.

And then I get serialization exceptions.

Look at the attached sample project.