@wiktor I think it's only temporary, it worked a couple of days ago when I checked. Also, only the about page is throwing the error, accounts are ok , e.g.: https://cmpwn.com/@sir
@ihabunek Oh yeah, interesting. I can't follow it either from mastodon.social (got 404 like you). But I could follow it just fine from my own small ActivityPub client (as seen on https://cmpwn.com/users/sir/followers). Maybe this really is some caching issue on mastodon.social...
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@ihabunek I think the problem is cmpwn.com is not running, check out that site in a browser, all I can see is "We're sorry, but something went wrong."