Disabling casues error

When I disable the issue tracker I get the following error

Fatal error: Call to a member function get_access_callback() on a non-object in /var/www/sites/all/modules/views/plugins/views_plugin_display_page.inc on line 78

I have Views 6.x-2.7 installed

after that I get the following warning at the top of every page

warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'project_issue_menu_access' was given in /var/www/includes/menu.inc on line 452.

Scott