on this page: https://crafttweaker.readthedocs.io/en/latest/#Mods/Modtweaker/TConstruct/Materials/ITICMaterial/
the old reference model for tinkers construct materials is still used. This can cause people to enter the wrong thing.
val stone = material:stone;
should be
val stone = ticmat:stone;

Should be fixed.

Yep, all better. Thanks!