Hmm, the page didn't load correctly

I recently purchased a new internet plan on 12/29 and created my Xfinity account. However, when I log into my account on the website, I get a "hmm, the page didn't load correctly" with an option to refresh the page, which does nothing. I would like to have this resolved as soon as possible as I move into a new place on 1/7 and need the internet set up as fast as possible.