Class 'Illuminate\Support\Facade\Mail' not found in laravel 5

I get this error message while trying to send email (Class 'Illuminate\Support\Facade\Mail' not found). in the controller, I have included 'use Illuminate\Support\Facade\Mail;' in the begining of the controller class (PostsController) and in the store function (of the controller), I have this

Mail::send('welcome_email', $data, function ($message) {
$message->from('walegbenga807@gmail.com', 'Coa Blog');

$message->to('nigeriawonderboy@gmail.com')->subject('There is a new post!');
});
return redirect('/')->with('status', 'ticket created');

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