migrate:refresh and migrate:reset gives Class '' not found error in laravel 5.1

I used the command "php artisan migrate:reset" and "php artisan migrate:refresh" both gives the error

[Symfony\Component\Debug\Exception\FatalErrorException]
Class '' not found

I also need to remove column from table using migration in laravel 5.1, please guide me or send me any reference links. Thanks

via Chebli Mohamed