[TYPO3-mvc] "Call to a member function attach() on a non-object" when using addUserGroup()

[Christian Essl]

Hi



  Extbase is driving me crazy here.... I try to create a new user and add an existing userGroup:

    if(!is_object($user))

    {

            $newUser = new Tx_Kbs_Domain_Model_User();

            // set the userData

            $userGroupRepository = t3lib_div::makeInstance('Tx_Extbase_Domain_Repository_FrontendUserGroupRepository');

            $userGroup = $userGroupRepository->findByUid(3);

            $newUser->addUserGroup($userGroup);

            $this->userRepository->add($newUser);

    }

    The groups Record Type is set to "Tx_Extbase_Domain_model_FrontendUserGroup".

    Now when I try to attach the UserGroup by "addUserGroup", I get the following error:

    Call to a member function attach() on a non-object in /usr/www/users/ltcdwu/typo3/sysext/extbase/Classes/Domain/Model/FrontendUser.php on line 215

    What is wrong there? There obviously is a UserGroup with uid 3.

    The new Users Record Type is set to the one from my extension. (Not to "Tx_Extbase_Domain_model_FrontendUser) Maybe this is the problem?