I think that means that something went wrong. I'll provide the installation steps below so you can check what possibly went wrong.
1. Extract the zip file of the Shadya mod.
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2. Copy the files inside this folder and paste them in the hornycraft game (When copying the files, make sure you copy the folders "mods" and "images", not the readme and/or other folders. You should paste them in the following path: ".../Hornycraft-0.23.1-pc/game/".) Also make sure you are playing in the most recent version of Hornycraft, since this feature is fairly new.
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3.Open the game and go to"mods"
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4. Normally you should be able to play the mod. (The top one is the Shadya mod.)
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You can let me know if this didn't solve your problem, and hopefully you can get it to work!