Kaltura_Client_Exception thrown

Invalid KS "ZDk2NGExOWZhMGIzMTdjZTg5Y2JmNjA4Mjk5OWQxZGQyZjU4NWEzY3wxMDE7OzE0OTM2NzkwNjk7MjsxNDkzNTkyNjY5Ljk2NztBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"