I can get to the site with no problem.
A DNS issue is not one you can fix on your end. Generally DNS issues come when someone changes their hosting. Changing hosting changes where the website is 'found'.
This would be a server side issue. If hosting has been changed, it can take from a couple hours to days for it to resolve. I'm not certain if this is a case of changed hosting or not, but there isn't anything we can do to 'fix' this... it's all in the hands of the internet gods.