Kaltura_Client_Exception thrown

Invalid KS "YWNlNjY2ZDI5M2NhOTcwZGMyMjYxMjQzOGY3ZDkwYTg2ZTU0Y2Q2MHwxMDE7OzE0OTYwNzE2NDA7MjsxNDk1OTg1MjQwLjA5MDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"