I assume your using the P3D swap utility. If you aren't, tell me. If you are, read on. I am also presuming you have white textures in game.
In the utility, there is the field "Texture folder". My guess is you haven't defined this right and written c:/...
In this you must put the addon folder, for example if your textures were in the pbo called 'newsoldier', and they were in a folder called 'soldiertextures', you would write in the texture folder field "newsoldier\soldiertextures\" but without the quotes. Try doing another p3d with this set like it is, but substitute the things in my example with your own.
If the textures are just in the pbo, you would type newsoldier\
IT IS IMPORTANT YOU INCLUDE BACKSLASHES
NOTE: Your final pbo must be called what is put in this field like here it would be newsoldier.pbo
Please tell me if this worked, and if it didn't tell me some more details and I'll see what I can do.