Kaltura_Client_Exception thrown

Invalid KS "N2FhMGQ3M2JjOGMyMzRkOTdmOTk2N2E1ZTlkYTVlZGY1NDFlNmFhYXwxMDE7OzE0NzUzODUzNDI7MjsxNDc1Mjk4OTQyLjE2MTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"