After installation this is what I get when I go to Forum-administration:

DB function failed with error number 1054
Unknown column 'g.id' in 'on clause' SQL=SELECT a.*, a.name AS category, u.name AS editor, g.name AS groupname, h.name AS admingroup FROM jos_fb_categories AS a LEFT JOIN jos_users AS u ON u.id = a.checked_out LEFT JOIN jos_core_acl_aro_groups AS g ON g.id = a.pub_access LEFT JOIN jos_core_acl_aro_groups AS h ON h.id = a.admin_access GROUP BY a.id ORDER BY a.ordering, a.name

Any help would be very welcome!
Thanks
Mordice

Did you COMPLETE the install in the control panel?

Yes I did. I now have (after I deleted the jos_fb tables and reïnstalled FB ) imported the Joomlaboard-data and still have this error...

Joomla 1.5 by any chance?

Oh sorry. No 1.0.11 is my version.

Have a look at this thread. It is older but may help.

I've read it over, but it says something about placing a file somewhere, but this file isn't there anymore...

Here.

Ha grumblemarc thanks! Something has changed... Now this is the message:

DB function failed with error number 1054
Unknown column 'g.id' in 'on clause' SQL=SELECT a.*, a.name AS category, u.name AS editor, g.name AS groupname, h.name AS admingroup FROM jos_fb_categories AS a LEFT JOIN jos_users AS u ON u.id = a.checked_out LEFT JOIN jos_core_acl_aro_groups AS g ON g.id = a.pub_access LEFT JOIN jos_core_acl_aro_groups AS h ON h.id = a.admin_access GROUP BY a.id ORDER BY a.ordering, a.name

Looks like the same error?