Laravel - Call to undefined method Illuminate\Console\GeneratorCommand::handle

I'm new to Laravel. and I was trying to create a new CRUD from terminal with this command:

$ php artisan panel:crud gallery

But, it gave me the following error that i have mention below. I've searched for it on google. but I didn't find anything that could help to solve this.

[Symfony\Component\Debug\Exception\FatalThrowableError]
Call to undefined method Illuminate\Console\GeneratorCommand::handle()

Can anybody put me on the right direction?

via Chebli Mohamed