ReflectionClass is gone

I was writing code to let only admins register
RegisterBlade accessed after editing cannot be displayed
I checked and found that the ReflectionClass was gone
But I want you to tell me because I can't do anything more

---

Rewritten location
RegistersUsers

return redirect(route('user.index'));
//$this->guard()->login($user);
// return $this->registered($request, $user)
//                 ?: redirect($this->redirectPath());

RegisterController

protected function create(array $data)
{
    return User::create([
        'name' => $data['name'],
        'email' => $data['email'],
        'password' => Hash::make($data['password']),
        'role' => $data['role'],
    ]);
}

and
web.php

Route::group(['middleware' => ['auth', 'can:system-only']], function () {

    Route::get('register', 'Auth\RegisterController@showRegistrationForm')->name('register');
    Route::post('register', 'Auth\RegisterController@register');

    Route::get('/home/user/create', 'UserContoroller@create')->name('user.create');

    Route::post('/home/user/create', 'UserContoroller@store')->name('user.store');

});

---

Here is line 788
class Container implements ArrayAccess, ContainerContract

public function build($concrete)
{
    // If the concrete type is actually a Closure, we will just execute it and
    // hand back the results of the functions, which allows functions to be
    // used as resolvers for more fine-tuned resolution of these objects.
    if ($concrete instanceof Closure) {
        return $concrete($this, $this->getLastParameterOverride());
    }

    $reflector = new ReflectionClass($concrete);

via Chebli Mohamed