“There has been a critical error on this website.”

The reason for the error should be visible in the error log. You can find it in your hosting area. If necessary, the support of your hosting can help you.

Alternatively, you could also enable debugging in WordPress. How to do this is described here: https://www.ads-software.com/support/article/debugging-in-wordpress/ – also here the support of your hosting can help you if necessary to edit the file accordingly.

In both cases you should be able to see what the cause is in the logfile.

This is a multisite and it’s the only sub site not working. https://stories.capeinfo.com and https://stories.capeinfo.com/portugal are working. This site has been working fine up to today.
I tried disabling all plugins in the network but that made no difference.

Did you manage to fix that? What’s the solution you found?