Kaltura_Client_Exception thrown

Invalid KS "ZmEzMjBkNDYzZGU0MTIzOWJiM2Y1OGQ3MThkMGEzNjMwODNiZjNlZnwxMDE7OzE0OTMzOTkwNDI7MjsxNDkzMzEyNjQyLjcwMjc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"