Couple of questions...
Is this intended to be a template? If so you need to go back and unpbo a template and review and use the .UNIT files. The UNIT files are missing so OFP doesn't know which players are which. I think this is a guess.
Or is this a mission just intended to play as it is?
When I try to load your mission in the OFP Editor the description.ext problem creeps up. Removing the double entry allows me to load your mission. By the looks of it, this looks like a regular mission.