Auxilium was updated recently (in #12), it's stopped to use res_mods to store saved configurations (mod cache), everything was moved to appdata... It's possible that you have to setup your tanks again, due to this change, and removing camo from all tanks on first use is a normal thing when you're using this mod for a first time. This might be your case. However the mod cannot sell paid samo, in very worst case it may buy camo (which was prolly fixed in latest update from #12), but not to sell anything.
There is probably one file missing, and due to this the mod cannot read from app data location, add this file DataPath.json in this example path: c:\Games\World_of_Tanks\res_mods\configs\BBMods\Auxilium\DataPath.json