Hi, I know it could be an annoying question for skilled developers but we have a major issue... this website ( http://www.swissdnabank.com ) worked fine til this afternoon, then suddenly appeared this error page... what could have happened?
It looks like somehow you don't have all of rails installed.
What's in the vendor/rails directory on the server?
You should have something like:
vendor rails actionmailer actionpack activerecord activesupport railsties
What version of rails?