One of my mapped domains is not showing up

I have a multisite, buddypress, pro site installation. On one of my member sites, I have the following problem:

When I click on the buddypress community tab on the main site, to access the list of blogs on my platform, I see this when trying to access this blog(screenshot attached). This site has a mapped domain and this feature worked a few days ago when I tried it. ALso, if I try to access this page from another page on my browser, independent of my site, it comes up just fine.

I have tried to access the other blogs, including those with mapped domains and they are pulling up just fine. Ideas? Linda