user register,email cant work

[geevest.com]

Hello,i have some problem with registered menu.
some my members cant register because the email cant accept :

*You do not have permission to perform this action. Please refresh the page and login before trying again. is in use
*Email does not match the one to the left

For Register menu panel :
Require Unique Email Addresses : No (Im Check No)

but some email always cant using for register.
how i can bypass this?

[Marco van Herwaarden]

These don't look like standard vBulletin error messages to me, most likely caused by a modification you have installed.

To troubleshoot this, please remove any hacks and disable your plugins, then see if you still have this problem.
Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

If so, reupload all the original vB non-image files (except install.php). Make sure you upload these in ASCII format and overwrite the ones on the server.

If your problem still exists, please create a new Style with no Parent set. Now browse the forum using this new style, do you still have the same problems? If you are troubleshooting login or guest issues, you will need to set this style as board default in the vBulletin Options.

[geevest.com]

okay solved.its becaused ajax register hack.thanks