Warning: Undefined property: App\Exceptions\Handler::$app in /var/www/html/app/Exceptions/Handler.php on line 51

Fatal error: Uncaught Error: Call to a member function environment() on null in /var/www/html/app/Exceptions/Handler.php:51 Stack trace: #0 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Exceptions/Handler.php(160): App\Exceptions\Handler->register() #1 [internal function]: Illuminate\Foundation\Exceptions\Handler->__construct(Object(Illuminate\Foundation\Application)) #2 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(952): ReflectionClass->newInstanceArgs(Array) #3 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(795): Illuminate\Container\Container->build('App\\Exceptions\\...') #4 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(986): Illuminate\Container\Container->resolve('App\\Exceptions\\...', Array, false) #5 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(296): Illuminate\Foundation\Application->resolve('App\\Exceptions\\...', Array, false) #6 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(908): Illuminate\Container\Container->Illuminate\Container\{closure}(Object(Illuminate\Foundation\Application), Array) #7 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(795): Illuminate\Container\Container->build(Object(Closure)) #8 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(986): Illuminate\Container\Container->resolve('Illuminate\\Cont...', Array, true) #9 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(731): Illuminate\Foundation\Application->resolve('Illuminate\\Cont...', Array) #10 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Application.php(971): Illuminate\Container\Container->make('Illuminate\\Cont...', Array) #11 /var/www/html/vendor/laravel/framework/src/Illuminate/Container/Container.php(1454): Illuminate\Foundation\Application->make('Illuminate\\Cont...') #12 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(497): Illuminate\Container\Container->offsetGet('Illuminate\\Cont...') #13 /var/www/html/vendor/laravel/framework/src/Illuminate/Foundation/Http/Kernel.php(146): Illuminate\Foundation\Http\Kernel->reportException(Object(Error)) #14 /var/www/html/public/index.php(51): Illuminate\Foundation\Http\Kernel->handle(Object(Illuminate\Http\Request)) #15 {main} thrown in /var/www/html/app/Exceptions/Handler.php on line 51