Kaltura_Client_Exception thrown

Invalid KS "NDI4NmJlNzQwOTdhNTljYmU0MDg4OTZiNjcwMzk1OTAwYTFiNjQ0ZnwxMDE7OzE0OTg0OTgxNzU7MjsxNDk4NDExNzc1LjczMDE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"