guard - Undefined method 'attempt'. in laravel VERSION = '7.30.4'

Question

I'm using Laravel 7.30.4 I want to authenticate Admins but I am experiencing this error,

Undefined method 'attempt'. I'm trying to make login with admin guard so i using in my 

LoginController

Here is a login function in my Logincontroller:

    public function login(LoginRequest $request){

        $remember_me = $request->has('remember_me') ? true : false;

        if (auth()->guard('admin')->attempt(['email' => $request->input("email"), 'password' => $request->input("password")], $remember_me)) {
           
            return redirect() -> route('admin.dashboard');
        }
       
        return redirect()->back()->with(['error' => 'erreur']);
    }
}

question from:https://stackoverflow.com/questions/65893532/undefined-method-attempt-in-laravel-version-7-30-4

Answer 1

Waitting for answers