Path in Classpath not found

Hi, all!

When I create a Web Dynpro-DC, I receive the following warnings:

[Warning]: Path in Classpath for file _webdynpro_model_dynamicrfc.jar not found.

and the same for all other Used DCs.

When I then rebuild the project, none of the referenced packages can be found.

Anybody got an idea?

Regards,

Thomas