Laravel Sentinel authentication is not working

I am trying to authenticate my usernane and password via sentinel authentication method in laravel.But the authentication is not working .Plz let me know where i am getting wrong.Below is my code.Thanks.

            $new_inputs['username'] = $inputs['mob'];
            $new_inputs['password'] = $inputs['password'];

            $credentials = Sentinel::authenticate($new_inputs);

            if ($credentials) {
return Lang::get('messages.info.loggedIn');
            } else {
                return Lang::get('messages.info.invalid_user');
            }

via Chebli Mohamed