Removing the User name and email fields?

But there isn't a plugin 'EB Register' ..

Hi Ralph

If you don't use that plugin, I don't know why the issue like you described could happen. Could you please submit a support ticket sending us super admin account of your site and the link to the page which I can see the error so that I can check it further directly on your site?

Regards,

Tuan

Hi, I have the same problem what did you find to be the issue here after the ticket was created?