Kaltura_Client_Exception thrown

Invalid KS "NWQ1MDA1YTc0YTNlNTc0YjU1ZjY2NDZkMWE0ODcxODBlNWM2ZGY3NHwxMDE7OzE0NzQ4ODY5MjA7MjsxNDc0ODAwNTIwLjA2MDc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"