Fatal error: Uncaught Error: Call to undefined function SM\app\Services\exec() in /www/wwwroot/bingjian.net/app/Services/CronService.php:48 Stack trace: #0 /www/wwwroot/bingjian.net/app/Providers/ClientCoreProvider.php(32): SM\app\Services\CronService->runTask() #1 /www/wwwroot/bingjian.net/core/Container.php(31): SM\App\Providers\ClientCoreProvider->SM\App\Providers\{closure}() #2 /www/wwwroot/bingjian.net/app/Providers/ClientCoreProvider.php(30): SM\core\Container->registerSingleton() #3 /www/wwwroot/bingjian.net/core/Application.php(39): SM\App\Providers\ClientCoreProvider->register() #4 /www/wwwroot/bingjian.net/core/Application.php(19): SM\core\Application->callServiceProviders() #5 /www/wwwroot/bingjian.net/public/index.php(16): SM\core\Application->run() #6 {main} thrown in /www/wwwroot/bingjian.net/app/Services/CronService.php on line 48