Error 1064 on forward engineering db model

[tomas bar]

Hi,
I've created a MysqQL model with MySQL Workbench and then tried forward engineering it to create the database.
However I get a Error 1064.
I also tried exporting the creation script from MySQL Workbench and then executing it in MySQL Query Browser, but I get the
same Error 1064. More precisely I get the following error message:

Script line: 11 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')
REFERENCES `htest1`.`cotxes` ()
ON DELETE NO ACTION
ON UPDATE N' at line 6


And the creation script that I execute is the following

***** BEGINNING OF SCRIPT

SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='TRADITIONAL';

CREATE SCHEMA IF NOT EXISTS `htest1` DEFAULT CHARACTER SET latin1 COLLATE latin1_general_ci ;
USE `htest1`;

-- -----------------------------------------------------
-- Table `htest1`.`chofers`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `htest1`.`chofers` (
`idchofer` INT NOT NULL AUTO_INCREMENT ,
`nom` VARCHAR(45) NOT NULL ,
PRIMARY KEY (`idchofer`) ,
CONSTRAINT `idchofer`
FOREIGN KEY ()
REFERENCES `htest1`.`cotxes` ()
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;


-- -----------------------------------------------------
-- Table `htest1`.`cotxes`
-- -----------------------------------------------------
CREATE TABLE IF NOT EXISTS `htest1`.`cotxes` (
`idcotxe` INT NOT NULL AUTO_INCREMENT ,
`marca` VARCHAR(45) NOT NULL ,
`chofers_idchofer` INT NOT NULL ,
`updated` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP on update CURRENT_TIMESTAMP ,
PRIMARY KEY (`idcotxe`, `chofers_idchofer`) ,
INDEX `fk_cotxes_chofers` (`chofers_idchofer` ASC) ,
CONSTRAINT `fk_cotxes_chofers`
FOREIGN KEY (`chofers_idchofer` )
REFERENCES `htest1`.`chofers` (`idchofer` )
ON DELETE NO ACTION
ON UPDATE NO ACTION)
ENGINE = InnoDB;



SET SQL_MODE=@OLD_SQL_MODE;
SET FOREIGN_KEY_CHECKS=@OLD_FOREIGN_KEY_CHECKS;
SET UNIQUE_CHECKS=@OLD_UNIQUE_CHECKS;

**** END OF SCRIPT


Do you have any idea of what I do wrong?
Thank you very much.