Remove texture and withoutsmoke. Pick a texture you would like from the files inside of it and just drag it into the custom skins folder. Depending on what is it. material,models etc. just drag in. Same with smoke. they are not supposed to be in that folder. Secondly remove "Offline" of it aswell. Now i would delete everything there and add them again since you have probably every file already added there. Try that and play. Most likely it is happening because you have offline version on the multiplayer aswell. Thats a no go.