Kaltura_Client_Exception thrown

Invalid KS "OGVjMjRmNDFkNzUyNjdiNDE3MDg1N2Y2NjBlMzNjNTA2ZTU4NGNlNnwxMDE7OzE0NzUxOTQ2NTY7MjsxNDc1MTA4MjU2LjQ3ODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"