Kaltura_Client_Exception thrown

Invalid KS "Yjc3NGI3MTZjNDk2OWI5MzEwOTY3NWQ0ZTgxZmEwZmZhODY3YWI5NHwxMDE7OzE0NzUzODU0MTA7MjsxNDc1Mjk5MDEwLjU5ODU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"