Kaltura_Client_Exception thrown

Invalid KS "NjE3MWU1Y2U3NGY3MzJlMjEyMWQ3ZjIzZGNmMGE5NGNjNjhlYWIwOXwxMDE7OzE0OTA0MDk0NDM7MjsxNDkwMzIzMDQzLjc5MjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"