Fatal error: Uncaught Error: Class 'Yar_Client' not found in /data/www/api-service/src/EdusohoNet/Service/Common/ServiceKernel.php:294 Stack trace: #0 /data/www/api-service/src/QiQiuYun/Service/Im/MonitorServiceRpc.php(25): EdusohoNet\Service\Common\ServiceKernel->rpc('IM', 'AnalysisService') #1 /data/www/api-service/src/QiQiuYun/Factory/Im/ServiceFactory.php(22): QiQiuYun\Service\Im\MonitorServiceRpc->__construct() #2 /data/www/api-service/bootstrap/adminui.php(200): QiQiuYun\Factory\Im\ServiceFactory->createService(Array) #3 /data/www/api-service/web/adminui.php(3): require('/data/www/api-s...') #4 {main} thrown in /data/www/api-service/src/EdusohoNet/Service/Common/ServiceKernel.php on line 294