Kaltura_Client_Exception thrown

Invalid KS "M2IxNTkyYjQ4OWY3YjM1Y2I5OTM5ZDY2NjZlNmQ5ZWMzNmJkZDkzNXwxMDE7OzE0NzI1ODY5MzQ7MjsxNDcyNTAwNTM0LjU3MjtBbm9ueW1vdXM7ZWRpdDoq", Error "-1,INVALID_STR"