Kaltura_Client_Exception thrown

Invalid KS "ZWQ3NTdlNGYzMDNiNDhhOTAzZTYyYmVkNDU5ZTRmYTNjNzVhYWFkN3wxMDE7OzE0OTMwNzA3MjE7MjsxNDkyOTg0MzIxLjkzNDU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"