Laravel 5.8 , customize register controller but weirdly not working, how to solve this error?

Argument 1 passed to Illuminate\Auth\SessionGuard::login() must implement interface Illuminate\Contracts\Auth\Authenticatable, string given, called in /home/mumildup/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Auth/RegistersUsers.php on line 35 {"userId":1,"exception":"[object] (Symfony\Component\Debug\Exception\FatalThrowableError(code: 0): Argument 1 passed to Illuminate\Auth\SessionGuard::login() must implement interface Illuminate\Contracts\Auth\Authenticatable, string given, called in /home/mumildup/laravel/vendor/laravel/framework/src/Illuminate/Foundation/Auth/RegistersUsers.php on line 35 at /home/mumildup/laravel/vendor/laravel/framework/src/Illuminate/Auth/SessionGuard.php:405)

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