发布文件显示这种错误是什么问题

PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function '_return_false' not found or invalid function name in D:\freehost\s100\web\wp-includes\class-wp-hook.php on line 286
PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function '_return_false' not found or invalid function name in D:\freehost\s100\web\wp-includes\class-wp-hook.php on line 286