Kaltura_Client_Exception thrown

Invalid KS "ZmY4YmQ5YTk2NDMyMjFkMjUzYTA0MWEzMjUxM2RmMTk0MGIxNTNhN3wxMDE7OzE1MDExOTY2NTc7MjsxNTAxMTEwMjU3LjQ4NDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"