Hi!
PQ version 3.95 introduced a bug for Rosy's Milk Machine scene. This would only trigger upon giving her the machine, not on later uses of the machine. It resulted in a missing image error, the game was looking for old files I renamed.
The following patch should fix that issue. To install; unzip the commonevents file and paste it in your "data" folder. This can be found under Peasants Quest NYD395\www\data\ for windows and linux users. For Mac it's under: Peasants Quest NYD395\Game.app\Contents\Resources\app.nw\data
I'll update the download links for a patched version of the complete game tomorrow, but in the mean time you can fix your current game by installing the patch. You can find the file attached to this post. Use the language version that applies to your version of the game (English/Chinese).
Tinkerer