modern acc error.

[Mesmeroo]

when i try to add a table to the db i get this error.

#1005 - Can't create table 'zilvera.posts' (errno: 150) (<a href="server_engines.php?engine=InnoDB&amp;page=Status&amp;token=99d9da43a54eddcdc9bd0cfca662a9d8">Details...</a>)

and im using this code to make it...

CREATE TABLE IF NOT EXISTS `posts` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `title` VARCHAR(120) ,
  `text` text,
  `time` INT(11),
  `author` VARCHAR(64),
  `board_id` INT(11),
  `thread_id` INT(11),
  PRIMARY KEY (`id`),
  FOREIGN KEY (`board_id`) REFERENCES `forums` (`id`) ON DELETE CASCADE,
  FOREIGN KEY (`thread_id`) REFERENCES `threads` (`id`) ON DELETE CASCADE
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

does anyone see the problem?