problem

[ Moderator note: title adjusted, please refrain from using help, urgent, emergency, asap, etc. in topic titles. ]

Hi,
I want to deactivate this plugin but its crashing all the pages by showing the following sentence repeatedly. Please help me

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘disable_all_widgets’ not found or invalid function name in /home1/karim/public_html/wp-includes/plugin.php on line 235