Using the Public Tender website just now I was shown this error message when trying to search for a tender.
I'm not sure why they think me contacting MY site administrator will help them. Still, as I said, all software breaks, be it open source or commercial. The trick is to spot it before your users and fix it - and, even better, anticipate the likely problem and make sure the error message is useful #fail #doublefail. They're probably all watching the rugby.