[TYPO3-english] mm_forum Usergroup

[Miguel]

Hi there everyone!

I have installed "mm_forum" in my Typo3 6.1, but when i'm configuring the extension, there is a step where i have to create two usergroups: a default usergroup and an administrator usergroup...
The problem is, when i try to create a new usergroup, typo3 gives me this error: "1: Attempt to insert record on page 'test_forum' (2) where this table, fe_groups, is not allowed"...

Can anyone tell me how to fix this and what i'm doing wrong?

Thank you very much