Fatal error: Uncaught Error: Call to undefined function checkauth() in /disk2/www/weiqin/addons/fy_lessonv2_plugin_exam/inc/mobile/cert.php:2 Stack trace: #0 {main} thrown in /disk2/www/weiqin/addons/fy_lessonv2_plugin_exam/inc/mobile/cert.php on line 2