since the author has changed the name of the mod, saves will no longer load. Do this, as a quick work around.

Open the launcher
Click on 'All Installed Mods' on the left hand side
Click on 'Upload Mod' in the top right
Click on 'Create Mod'

In the 'Name' text box type : stupid puppet don't send division to me
In the 'Directory' text box type: stupid, should look like 'mod/stupid'
In the 'Version' text box type: 1
Select a tag, I selected 'Fixes'

Click on 'Create Mod' Bottom right,

You will get a window saying 'Your mod has been created'

Click on the 'X' in the upload mod box.

Go into Playsets, and add the mod you just created.

Your Save should now work.