I think it is complaining that both the module and version share the same name 'stomp', try using different version and module names.
I have not yet found this documented in the App Engine documentation, but it appears to be a restriction that you cannot have a module name the same as its version name, for example a module with this yaml file will not be updatable:
application: my-app-id
version: test
module: test
runtime: python27
api_version: 1
threadsafe: true
Although you will be able to run an update, to upload the initial version of your module, when you try to update it a second time it will fail with this error:
Error 400:
--- begin server output ---
Version 'test' is already in use as a module name. Please use a different version.
--- end server output ---