i upgrade vbulletin from 3.8.4 to 4.0.8 , all upgrade proces pass without error but when was finish i get this error , can anybody explain what this mean ???

Code: 
Warning: array_merge() [function.array-merge]: Argument #1 is not an array in [path]/includes/class_bootstrap.php(1280) : eval()'d code on line 4

Fatal error:  Call to a member function hide_errors() on a non-object in /home/rapidcro/public_html/includes/class_bootstrap.php(394) : eval()'d code on line 1138
when i go to admin cp :

Code: 
Warning: fetch_template() calls should be replaced by the vB_Template class. Template name: btext in [path]/includes/functions.php on line 4007

Warning: array_merge() [function.array-merge]: Argument #1 is not an array in [path]/includes/class_bootstrap.php(1280) : eval()'d code on line 4

Fatal error:  Call to a member function hide_errors() on a non-object in /home/rapidcro/public_html/includes/class_bootstrap.php(394) : eval()'d code on line 1138
Resident Reviewed by Resident on . need help !!! i upgrade vbulletin from 3.8.4 to 4.0.8 , all upgrade proces pass without error but when was finish i get this error , can anybody explain what this mean ??? Warning: array_merge() function.array-merge]: Argument #1 is not an array in /includes/class_bootstrap.php(1280) : eval()'d code on line 4 Fatal error: Call to a member function hide_errors() on a non-object in /home/rapidcro/public_html/includes/class_bootstrap.php(394) : eval()'d code on line 1138 when i go to admin cp : Rating: 5