Like andyg said, you should try raising the debuglevel. The highest is level 9, but a lot of unnecessary information will be given.
Ofcourse, with a lower debuglevel, crucial info might be left out, so it never hurts to try debuglevel 9.
Next to that, the error states it has trouble accessing the database.
First of all I can tell you that as soon as Firefly hits an error, it shuts itself down.
A common error is the database getting corrupt. Why or how? We don’t know. If we did, we would’ve fixed it.
Another possibility is the database being locked, due to a failure at releasing the lock the last time it accessed the database.
But these are just ideas. I suggest raising your debuglevel in order to get more information on the crash.