Kaltura_Client_Exception thrown

Invalid KS "NTMyMzlkYTlkYWRiNWRmYjQ2NjA2NDUyMDY4N2ExNjM4NDU2YjI5OXwxMDE7OzE0OTgzNjg5NzY7MjsxNDk4MjgyNTc2LjY4MDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"