Uninitialized constant Rake::DSL

Hey,

I’ve got the following problem on our jenkins server:
https://gist.github.com/460e96b3e77a7345b2b8

Locally it is running fine and I don’t see any differences, rake version
is
0.9.2.2 on both machines
gem list on the server returns:

Does anyone know what else this could be? How can I debug the problem?

Thanks a lot,
Christoph