Hi folks,
I completed the 1st 'Tenderizer' mission to inspect the the Sentry guns and then protect the Galatea.
From there I got a second mission to destroy some freighters and some transports without destroying the cargo. This mission seems unreasonably hard, and possibly bugged.
As soon as the Shivans left the cargo behind I attacked and destroyed both the Asmodeus freighters and the 2 transports. But I still got a prompt saying "Secondary objective failed".
I could not make out if one of my wingmen destroyed a Shivan cargo or if the game still considered the freighter as escaped after being destroyed. Also, unlike the 2 Asmodeus freighters, the transports never dropped their cargo. So, I decided to try to finish the mission and look at the recommendations to find out what went wrong.
However, I never got a chance to find out what went wrong, as the game crashed after completion of the mission giving this error:
Error: Mission name btm-04.FSM not found in campaign file for next-mission command
File:D:\PROJECTS\FREESPACE\Parse\SEXP.CPP
Line: 3881
Call stack:
------------------------------------------------------------------
------------------------------------------------------------------
Is there any way to finish the game?
I read about the Freespace 1 mod for Freespace 2 in another thread. I have Freespace 2 as well so I can install that. However, will I have to restart the campaign if I do this?

Thanks, Zam. I'll try the mission again and look for the other 2.
I remember seeing 2 freighters: Astaroth and Baal. Both were Asmodeus class.
and 2 transports: Belial and Liliath (or something similar).
I thought the rest were fighers.
Maybe the game loads a different result for success and a different result when you fail. Hopefully the bug won't hit if I succeed.
If that doesn't work I'll try backing up my pilot file and re-installing as you suggested. Thanks again.
Edit: I replayed the mission and found the other 2 freighters. The bug didn't hit this time. The mission wasn't a complete success, however. The recommendations stated that there was a way to figure out what made the Shivan fighters appear. I'm gonna replay the mission again to find out.