Kaltura_Client_Exception thrown

Invalid KS "NTAwMjA1ZDljMGEwZTJkMDAyYjM2NDEwZTNlOTcyNTliYzIwNjJlN3wxMDE7OzE0ODc4NDg1NzM7MjsxNDg3NzYyMTczLjkyNzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"