Kaltura_Client_Exception thrown

Invalid KS "NDdhMTUyODU3OWM1NjY5OGY4MzZjZjE2ODc4MmZlOWQ2MmNmNGIyYnwxMDE7OzE0OTM2NTcyNDg7MjsxNDkzNTcwODQ4LjA5NTI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"