Kaltura_Client_Exception thrown

Invalid KS "Yjg1NmI3ZTdiNzMxY2JhZDM4Yzk1MjA1ZjRhZjRhOTU1OGY0NGVlY3wxMDE7OzE0Njk5MTYxOTc7MjsxNDY5ODI5Nzk3LjA3NTQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"