Spring plugin ClassCast exception

Hi,

I am using IEDA 5.0.1 with the Spring plugin 1.0 beta 3 under Linux. I did install the plugin according to the instructions (copied idea-spring-parser.jar and removed picocontainer-1.1.jar).

Here is the exception I am still getting:

One of the sets does not show up at all, probably because of the exception.

Any clues what is wrong?

Thanks,
Marius