Kaltura_Client_Exception thrown

Invalid KS "OGU0N2Y1Nzk5NWE4M2JiY2NjYTFiZmU5MWZkNjI2OGVjYThlNWU4MnwxMDE7OzE0OTMxMDY4MTA7MjsxNDkzMDIwNDEwLjgzMjY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"