laravel 5.1 Password::reset returns passwords.password

I have this function in controller and I can't reset password

public function postReset(Request $request)
{
$this->validate($request, [
  'token' => 'required',
  'password' => 'required|confirmed|digits:5',


]);

$credentials = $request->only(
  'email', 'password', 'password_confirmation', 'token'
);

$response = Password::reset($credentials, function ($user, $password) {
  $this->resetPassword($user, $password);
});

dd($response);
switch ($response) {
  case Password::PASSWORD_RESET:
    return redirect($this->redirectPath());

  default:
    return redirect()->back()
      ->withInput($request->only('email'))
      ->withErrors(['email' => trans($response)]);
}

}

protected function resetPassword($user, $password)
{
    $user->password = bcrypt($password);
    $user->save();
    Auth::login($user);
}

but it always says

Whoops! There were some problems with your input.

Passwords must be at least six characters and match the confirmation.

and when I added

dd($response);

it prints passwords.password

Any idea how to solve this?

via Chebli Mohamed