49
The only reasons for that are:
1. Permissions to xoops_data folders
2. full database
3. sessions table in db
So just clear your session table in database!
I got the same error and find some solutions here, on xoops forum.
PS thanks GHIA for that!
1. login into your database via MySQL Admin
2. find "session" table and clear it!
3. Make sure that "xoops_data" folders have write permissions (777)
4. Clear your sessions and cookie in webbrowser.
(5 upgrade to 2.4.4 ;) )