When i install plugin : Media Center Extensions. it appear
Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘TransferOutBeforeUpgrade’ not found or invalid function name in /Applications/XAMPP/xamppfiles/apps/wordpress/htdocs/wp-includes/class-wp-hook.php on line 298
Can everyone help me? 🙁
Thanks so much
- The topic ‘Causes errors to appear on every admin page.’ is closed to new replies.