Forum Upgrade from 3.8.5 to 4.0.4
 

I need help. Everyting is going weel and when I try to loog in the admin cp I get this message:

Fatal error: Call to a member function hide_errors() on a non-object in /home/******/public_html/forum/includes/class_bootstrap.php(394) : eval()'d code on line 93

What do I have to do? Please help.