Kaltura_Client_Exception thrown

Invalid KS "ZGYyZGM4MGVlZWY1ODAzOTgyYjVkNzdkNjMxNjlkNzY3NmQ0MTRiMHwxMDE7OzE0OTg0MDc2Mzk7MjsxNDk4MzIxMjM5LjA3MTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"