Fatal error: Uncaught Error: Call to undefined function App\Exceptions\logger() in /mnt/seozhanqun/app/Exceptions/Handler.php:58 Stack trace: #0 /mnt/seozhanqun/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(326): App\Exceptions\Handler->render(Object(Illuminate\Http\Request), Object(Symfony\Component\Debug\Exception\FatalThrowableError)) #1 /mnt/seozhanqun/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(124): Illuminate\Foundation\Http\Kernel->renderException(Object(Illuminate\Http\Request), Object(Symfony\Component\Debug\Exception\FatalThrowableError)) #2 /mnt/seozhanqun/public/index.php(112): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request)) #3 {main} thrown in /mnt/seozhanqun/app/Exceptions/Handler.php on line 58