Put in Name and Comment but get Error Asking For Name and Email, No Email Field

When someone wants to make a comment on one of my posts or pages, it asks for name and then the comment. However, after you hit enter an error appears asking for Name and Email address. The name field is there but there is no email address field there. I don't want the email address. Just the name. How do I stop this error? Also, I will sometimes get an error saying that I'm inputting too quickly. Please answer this so that it is quite clear in the steps that I have to do. Please do not assume that I know steps or terminology as I'm am completely new to WordPress. Please help as I can't change themes now. My entire site is built around this theme. My site is http://www.richartiststarvingartist.com