Major issues with my forum, including sitemap and URL errors in google, 2 title tags
 

I am having some serious difficulties with my forum!!!

First off, my google webmaster tools is telling me that there are errors in URL in Sitemaps and I have HTTP errors (my site does not exist, and it shows 404 error).

I also am being told that I have 2 titles, which I am not sure how to fix.

And lastly, I have too many pages according to a meta tag analyzer - here are the results:

Web page analysis.
This page contains too many URLs.
This tag contains 126 urls. Some Search Engines have problems with more than 100 urls on a page. The size of the web page is to big.
The size of the web page is 58028 bytes.

Could someone please chime in and suggest what is happening? Perhaps I have installed it wrong? I actually got it installed professionally so I wouldn't think this was the case...it is frustrating since google will not index my site!

Thank you in advance for any help you can provide.

Alright, so I seemed to fix the sitemap issue in google - however, my forum still shows over 500 pages when I use a meta analyzer and it claims it is too big of a website - is this normal for a forum since there is so much content?

Is this normal?