Redmine

Hi,

I've migrated my Redmine 0.8.3 to Redmine 0.9.3 last week. It worled like a charm until this morning. Both pre-prod and production redmine have this error, but searching through the logs, I couldn't find an answer.
It seems like redmine's log stopped friday (I didn't work with redmine this week-end) and I have no other source of information.

Did someone encounter a 500 error one week after a migration?