I downloaded and installed the Wpforo-user-custom-fields-1.1.5.zip file.
Member cannot register. Error: Registration error
The problem was solved when I disabled the plugin.
I can't use the plugin on my site.
Could you please: https://www.turkceci.net/forumlar/?foro=signup
Please send the admin login details to info[at]gvectors.com email address. I'll ask the developers to check the issue for you.