Kaltura_Client_Exception thrown

Invalid KS "ZWRiMWM2Zjc1YjljYWI3ODBjYWY2MWI4MDg2OGMzZWU4ZTc5ZTY3MnwxMDE7OzE0NzUzNjE0MTc7MjsxNDc1Mjc1MDE3LjEwNTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"