Please attach the page when posting questions instead of using copy/paste so I can open and view the code in Dreamweaver.
It looks like you have two Server Validations server behaviors on the page, and you have blank lines in your code.
Delete the second one, and delete the blank lines.
Then it looks like you have unique value server validation... That won't work, since you are comparing the values of two columns. Instead copy/paste the players recordset above the Server Validation code and add number validation to validate the value of:
<?php echo($players->TotalRows); ?>
Set the max value to zero (no matched rows).
After doing that, if it still doesn't work, attach the page to a reply and I'll take another look.