my website is not showing up error after installing and uninstalling Real Estate (firestorm)

Hi ,
after I have installed the wp plugin Real estate (firestorm) since you guys don't have any currently I seem to have mess somethings and when I type my domain name it shows up like

I have a MU set up and other parked domains are showing up okay.
After turning off all the plugins ,still didn't resolve the issue .
I checked the backed up hta and wpconfig against the latest one and they seems identical.
I'm still on wp 3.5 .Any help is appreciated .