Kaltura_Client_Exception thrown

Invalid KS "ZGEwMmI4MDY1NTA1Y2RmY2JjMTEwZDlhYjkzMDNkM2FjNmQyZDUxOHwxMDE7OzE0OTMxMDY3Nzc7MjsxNDkzMDIwMzc3LjI3MjI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"