Danny. I don't have this particular campaign. Campaigns including 3rd party aircraft are usually the most difficult of all addons to install properly or troubleshoot. You must have all the necessary files for any chance of success. Some campaigns/missions require separate downloads of aircraft & other files. Read the instructions carefully & make sure you have everything. The most common cause of error messages is missing or incorrectly installed 3rd party aircraft. Missions will work without 3rd party scenery installed. (It won't look right but they will work.)

In most cases the aircraft are recognised in missions by their folder names. These must be exactly right. This will obviously depend on the method you use you install them. Unzipping files direct to the sim is the most common cause of problems & I would never recommend it.

Aircraft configured as unflyable AI Only drones must have Panel & Sound folders to work, even if these folders are empty. Also make sure you haven't removed/renamed/modified any of the default aircraft. Finally, you might have too many aircraft installed. Exceeding the CFS2 "100 plane" limit often causes problems. This can easily happen when people start installing complex campaigns. If you have anywhere near this amount of aircraft in CFS2 try removing a few. There is a debug utility by Paul Hauschildt posted in CFS2 utilities that you might find useful if you can figure out how to use it. http://www.simviation.com/cfs2utilities1.htm

If all else fails find a file named Error.log in your CFS2 root folder & open it in Notepad. Copy/Paste the contents here.