Help adding new abbey kind of building

Help,
Does anybody what causes the following error?

Buildings not parsed, they must be parsed before units...

I got it when I tried to add the abbey from the Viking Invasion campaign to the Europe one. I only copied the abbey line from the Viking_BUILD_PROD file and added it to the bottom of the Crusader_BUILD_PROD file, nothing else at all.

Thanks in advance

Cheers,
Sir Zack

erm...i had that. had to fix teh names of the prod files now zee game wont start