Domain Registrars Page Memory Error

Hi,
I am trying to configure the registrars for my WHMCS panel. When viewing the registrars page, I am not able to click any of the buttons and it loads with this error message:

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 16400 bytes) in /home/.../public_html/whmcs/includes/classes/WHMCS/Module.php on line 0

I've already tried replacing the Module.php file and I'm running the latest version of WHMCS. I haven't changed any of the directories either. I'm not exactly sure what is wrong.

Any ideas?

Thanks!