If you are able to access the site through your cellphone connection but not Wifi, then it's likely related to a caching issue. The website is up and running for us when we go to your site now.
If you updated your DNS recently, it will also take some time for the update to propagate globally. Various ISPs can cache DNS settings for some time, typically up to 24 to 48 hours.
What exactly is the error you are seeing?