Kaltura_Client_Exception thrown

Invalid KS "NzJjOTIxN2ZlNjNmZDNjM2YyZjA0MTZiMzY3YzlkNjExMjg5MGNjM3wxMDE7OzE0OTA4NDQzMjM7MjsxNDkwNzU3OTIzLjIwMDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"