I use 2.0.17 and newbb2.0

After the big problem I had the last couple of weeks we were able to put back the forums but nothing worked with newbb 3.08 so we installed the newbb2.0 but now we are still having permissions problems. Even though the categories are set to be seen by members or guests no one other than admin can see any forum. Also when I go to module/newbb/forum/edit I get the following error;


Fatal error: Call to undefined method NewbbFormSelectUser::XoopsFormSelect() in /homepages/27/d....../htdocs/modules/newbb/class/formselectuser.php on line 35

We don't know what to do, searched every forum here, checked the tables and codes but we are not able to find anything.

Can somebody please show us a way to get rid of this problem...

This could indicate you have files mixed from the two versions.
Make a backup copy to your PC and do a file compare with the original distribution set.