#1005: Cannot create table.frm (error 121)

I generally use phpMyAdmin but am using MySQL workbench to set up everything ahead of time and organize it.

I right click my table, and "Copy SQL to clipboard". This is what I got:

CREATE  TABLE IF NOT EXISTS `mydb`.`tblArticleClicks` (
  `click_id` INT UNSIGNED NOT NULL AUTO_INCREMENT ,
  `article_id` INT UNSIGNED NULL DEFAULT 0 ,
  `click_ip` VARCHAR(15) NULL ,
  `click_ip_long` INT UNSIGNED NULL DEFAULT 0 ,
  `click_time` INT UNSIGNED NULL DEFAULT 0 ,
  PRIMARY KEY (`click_id`) ,
  INDEX `FK_ARTICLE_ID` (`article_id` ASC) ,
  CONSTRAINT `FK_ARTICLE_ID`
    FOREIGN KEY (`article_id` )
    REFERENCES `mydb`.`tblArticles` (`article_id` )
    ON DELETE CASCADE
    ON UPDATE CASCADE)
ENGINE = InnoDB

Code (markup):

This is what I get in return:

#1005 - Can't create table './mydb/tblArticleClicks.frm' (errno: 121)

Code (markup):

Have I set it up wrong/is it invalid SQL/something I need to do first? Any insight greatly appreciated!