Eclipse Scala plugin: "illegal circular inheritance"

Question

I just upgraded to the latest version of Scala -IDE on Eclipse and highlighted a lot of false errors of "illegal cyclic inheritance" in the code, which, as I know, was ok (it was before, and it still compiles and runs fine).

Any way to fix this? If not, how can I revert to the previous version? I do not see the possibility of rolling back or downloading earlier versions on the Scala IDE website.

Thanks.

edit: Never mind, he spontaneously sorted himself after about 10 minutes, showing errors. The question remains, if someone else gets it.

Answer 1

"Project → Clean Project" always helps me when Scala -IDE shows strange error messages.

Answer 2

Sometimes errors are displayed in the editor, but not in the package explorer. Things still seem to compile fine when this happens.