Kaltura_Client_Exception thrown

Invalid KS "NDFmZmY1MWNkNTZiYmMxNGRiOTllODAxMDgzYjc2ZmRlN2U1ZDZiNHwxMDE7OzE0OTYxOTU4NzU7MjsxNDk2MTA5NDc1Ljg1NjI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"