When trying to create a new calculated column in a specific sub-site, I receive the "Sorry, something went wrong. An unexpected error has occurred." screen. A couple of strange things here:
1. This only occurs in a single sub-site. Calculated columns can be created in other sub-sites and at the site collection level.
2. The error page displays immediately after clicking the "Calculated" radio button on the "Create Column" screen. It would seem more "normal" if clicking the OK button triggered the error, as that's when the column is being created, but I can't even get that far.
I've tried an IIS reset on the web server, but the behavior persists.
Many thanks for any and all help!