No, that's the problem: It's right when enter the campaign, before the first mission briefing even starts --
Freespace was unable to find 2 weapon classes while loading this mission. This can happen if you try to play a campaign that is incompatible with the current mod.
I did apply the "fix" found on Freespacemods, though, maybe trying it without that will fix it.
Edit: that certainly did not work!

The way I got the campaign was by going to:
http://freespacemods.net/search.php?q=flames&r=0&s=SearchI got the bottom one, then the middle one, and applied the fixes to the original FOW_Chapter1 with QuickVP. Is there some other way I should have gone about it?