Hello Adam,
thanks for your quick reply. It seemed that I really forgot to place the binaries. I copied them into the 'bin' folder and reinstalled the module definition.
Still I get an error message
DotNetNuke.Services.Exceptions.ModuleLoadException: Specified cast is not valid. ---> System.InvalidCastException: Specified cast is not valid. at DotNetNuke.UI.Skins.Skin.InjectModule(Control objPane, ModuleInfo objModule, PortalSettings PortalSettings)
--- End of inner exception stack trace ---