Kaltura_Client_Exception thrown

Invalid KS "YWQ3NmY1NmI2ZThlMTA1NzM0MzZiMDFkNjM5Y2ZjM2Q3OTk0ZWNhM3wxMDE7OzE0ODUwNTkxMDk7MjsxNDg0OTcyNzA5LjU2MDg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"