Kaltura_Client_Exception thrown

Invalid KS "ZGRjMGRjNTAwZmU0OTZkNDJjNzJkMGYyY2U3NjdhYTNiYTllZGE1ZnwxMDE7OzE0OTU3MzU0MjE7MjsxNDk1NjQ5MDIxLjc3NDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"