Auth guard [] is not defined.

I upgraded a filament project from v2 to v3. Everything went on well based on the on the upgrade guide. However, when I try to access the admin panel https.example.com/admin/login, I'm getting Auth guard [] is not defined. error.

I have not been able to wrap my head around it for over 1 hour now.
Solution
Thanks @DrByte and @Dennis Koch for your contribution. I have found the issue. When I was in v2, I have Horizon and Telescope setup locally, and in their service provider, I have this block of code which was referencing the old filament config

protected function authorization()
    {
        Auth::setDefaultDriver(config('filament.auth.guard'));

        parent::authorization();
    }


Removing it solved the issue
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