I love this theme and have had my website on it for years but I just upgraded the theme and my website is gone!! I am going crazy, when I type in my website it just says "Not found" what you are looking for is not here, I have tried everything, I unistalled and reinstalled it 3 times, still nothing, even if all my personal stuff was gone and all the pre-set stuff was there I could just rebuild it like I wanted to anyway but the pre-set stuff is gone, its just a blank white page with the error above, what could have happened? I am lost.

if you are tyoing in the url for your site (shwa is it?) and you get a not found, one of two things might be happening
1) the domain name has expired
2) the domain name is pointing to a folder that is not where your site is.

You should contact your host to get help finding out what is going on.