I assume you have installed a P-40 cockpit, but now find you are missing certain cockpit textures.
To fix this, I think, depends on which install you are using. If the cockpit is from an ETO P-40 and you are moving it to another install, look in the Aircraft/Shared folder and you will see ETO_Kittyhawk_shared folder. Then move it to the same file in the install. If from MAW, look for DR_Tomahawk_shared. If PTO, it's warhawks_shared.
At least I think that's the issue you are raising. Cleary you are missing some shared textures.