Kaltura_Client_Exception thrown

Invalid KS "MDgxYjQyN2EyYzY4MTA0M2U1MzNmYWRjYjg0YjI1ZmI4YTRhMWIyYnwxMDE7OzE0OTMzMjI2MDk7MjsxNDkzMjM2MjA5LjMyODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"