Warning: Undefined variable $property in C:\Program Files\WAMP\www\library\core\functions\kontakt\kontaktform.php on line 64

Fatal error: Uncaught TypeError: get_class(): Argument #1 ($object) must be of type object, null given in C:\Program Files\WAMP\www\library\core\functions\kontakt\kontaktform.php:99 Stack trace: #0 C:\Program Files\WAMP\www\library\core\functions\kontakt\kontaktform.php(69): KontaktForm->_extendedFill() #1 C:\Program Files\WAMP\www\library\core\functions\kontakt\kontakt.php(62): KontaktForm->__construct() #2 C:\Program Files\WAMP\www\library\core\functions\base\rmodel.php(375): KontaktModel->__construct() #3 C:\Program Files\WAMP\www\includes\application.php(859): RModel::getRimModel() #4 C:\Program Files\WAMP\www\includes\application.php(565): Application->_getRimModel() #5 C:\Program Files\WAMP\www\includes\application.php(164): Application->_runFrontend() #6 C:\Program Files\WAMP\www\index.php(26): Application->run() #7 {main} thrown in C:\Program Files\WAMP\www\library\core\functions\kontakt\kontaktform.php on line 99