hook error

[firehawk66]

Hi guys, I posted this problem in the beta patch section with no response so thought I'd try here.
Since the latest patch I cannot get the quick mission low-level even dogfight to work, it starts to load then gives a Hook:{FuelTank04} not found error. The bomber intercepts still work so I'm wondering if it is to do with the Bf110 that features in that particular mission.

[MarkHollis]

Hi, first of all I am not a programmer and just work through logically subtracting and adding. After I upgraded I had the message:
Error loading mission
Hook: {FuelTank04} not found.
I did several upgrades so found it tiresome to pin it to one version.
The clue is the description of the fault - fueltank (Plane). When I was loading in the skins for the planes into paint schemes I was merging the two folders when if fact I should have deleted the old folder with the same plane model and put in the new one. Mixing the two seemed in my case at least to mess up the operation. I know that some may say well of course you do that but I thought the new plane upgrades were "Top ups" of the old not replacements. I may be completely wrong and if someone politely points out the real reason they are welcome.