Method Illuminate\Auth\RequestGuard::attempt does not exist

Question

I am new to both laravel and lumen. I was creating a login api with oauth2.0 in lumen 5.6, i have installed passport and generated token. Below is my login controller function a

Answer 1

Changing default guard to "web" fixed my problem.

config/auth.php:

'defaults' => [
        'guard' => 'web',
        'passwords' => 'users',
    ],