Target [Illuminate\Database\Eloquent\Model] is not instantiable. for User

I have a Laravel Filamentphp application, with User Model, it was working all fine. Suddenly it started giving error Target [Illuminate\Database\Eloquent\Model] is not instantiable. on Create Action

The entire things works fine for the Edit/Update Action (which basically uses the same form/components)

What could be wrong?