Tom. I have no knowledge of this campaign/mission. It's possible you need to download some elements separately. Read the instructions carefully & make sure you have all the files. Look in the CFS2\SHIPS folder for a folder named Sha_California. The airport file might be associated with scenery although this would not usually cause an error message. If it's there, make sure it's installed properly. CFS2 ships are configured in the same way as aircraft with the usual Model, Panel, Sound & Texture subfolders. If it's not there you didn't install it.

If you can't figure it out & the file is posted at SimV, tell me exactly where to download it & I'll check it out myself.

Tom. If it's looking for a SHA_xxxxx folder it must be a CFS2 mission. CFS1 does not feature ships. I seem to remember this problem cropping up before but I no longer have the files. if I knew where to download it I'm sure I could figure it out.