the version im on is prefab-1.3.0.11.jar for minecraft 1.12.x the only thing thats working is the starter house, no other buildings are working :), just a heads up.
and every time you try to preview a building it would crash minecraft.

Thanks for the heads up. It looks like Prefab isn't a part of the normal install. What version of AllTheMods 3 are you using?

This appears to come from the mod "Plants" I have a fix for what that mod does to the game and am testing against AllTheMods 3 again to make sure I didn't miss anything.

This has been fixed with 1.3.0.12 which is now available on CurseForge.

thank you for responding so fast