Kaltura_Client_Exception thrown

Invalid KS "ZTIyNjhmZTE5ZTA5MTNlMmI5NTFjNGViNmQ5MzAzYzE5NGNiZmFiOXwxMDE7OzE0OTMwNTczNzE7MjsxNDkyOTcwOTcxLjg2MDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"