After our hosting provider has migrated our website to a new server this fatal error occurs when accessing the site:
Fatal error: Cannot redeclare ctools_menu_add_tab() (previously declared in /www/htdocs/mysite/drupal/sites/all/modules/ctools/includes/menu.inc:42) in /www/htdocs/mysite/drupal/sites/all/modules/ckeditor/ctools/includes/menu.inc on line 49
Now the mother of all questions: How can I fix this? :(
We're using Drupal 6 and – although I haven't checked it yet – all files and databases should have been copied correctly by our hosting provider.