Fatal error: Uncaught TypeError: Argument 1 passed to remove_tone() must be of the type string, null given, called in /www/wwwroot/xuehanzi.net/www/siteweb/caches/caches_template/default/content/show_chengyu.php on line 12 and defined in /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/libs/functions/extention.func.php:338 Stack trace: #0 /www/wwwroot/xuehanzi.net/www/siteweb/caches/caches_template/default/content/show_chengyu.php(12): remove_tone(NULL) #1 /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/modules/content/index.php(233): include('/www/wwwroot/xu...') #2 /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/libs/classes/application.class.php(31): index->show() #3 /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/libs/classes/application.class.php(19): application->init() #4 /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/base.php(128): application->__construct() #5 /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/base.php(79): pc_base::_load_class('application', 'libs/classes', 1) #6 /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/base.php in /www/wwwroot/xuehanzi.net/www/siteweb/phpcms/libs/functions/extention.func.php on line 338