创建表时 MySQL 错误 1022

MySQL Workbench came up with the following SQL to create a table:

CREATE  TABLE IF NOT EXISTS `mydb`.`errors_reports` (
   `error_id` INT NOT NULL ,
   `report_short` VARCHAR(15) NOT NULL ,
PRIMARY KEY (`error_id`, `report_short`) ,
INDEX `error_id_idx` (`error_id` ASC) ,
INDEX `report_short_idx` (`report_short` ASC) ,
CONSTRAINT `error_id`
   FOREIGN KEY (`error_id` )
   REFERENCES `mydb`.`errors` (`error_id` )
   ON DELETE NO ACTION
   ON UPDATE NO ACTION,
CONSTRAINT `report_short`
   FOREIGN KEY (`report_short` )
   REFERENCES `mydb`.`reports` (`report_short` )
   ON DELETE NO ACTION
   ON UPDATE NO ACTION)
ENGINE = InnoDB

这对我来说看起来不错，而且我的数据库中还有一堆其他非常相似的表，MySQL 非常乐意创建这些表.

ERROR 1022 (23000): Can't write; duplicate key in table 'errors_reports'

CONSTRAINT `error_id`
    FOREIGN KEY (`error_id` )
    REFERENCES `mydb`.`errors` (`error_id` )
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,