play.Logger error: Module %name% will not be loaded because about play-gae HOT 3 OPEN

I don't really see a possible cause of your problem.
IMO, you should try with play1.2.3 and the new dependencies.yml which is far better.
I'm currently upgrading play-gae to GAE SDK 1.6.0.

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I have also this issue with playframework 1.2.5, gae 1.6.0 and siena 2.0.7.
dependencies.yaml :

# Application dependencies

require:
    - play
    - play -> gae 1.6.0
    - play -> siena 2.0.7

application.conf :

# —- Google app engine module —-
module.gae=${play.path}/modules/gae-1.6.0
# —- Siena module —-
module.siena=${play.path}/modules/siena-2.0.7

My application is working fine, though. So for the time being, I ignore the error message in the GAE logs, but I'm still a little worried.

By the way, you need to specify the module in application.conf if you want to be able to deploy the app to GAE.
Not sure if this is a bug, though.

from play-gae.

You only need the dependencies. You should leave out the module stuff in application.conf. Deploying to gae can be done using play gae:deploy

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