[22:06:51] [Server thread/INFO]: [VeinMiner] Unknown or invalid block state string for input: "minecraft:grass". Is it an item?

The default config as a whole probably just needs an update for modern versions. I'm sure there are some blocks that were added and/or changed that need updating.

Forgot to link it, but it has been updated to short_grass in afd60a6f34ebdf4219a2cd926528cf29a9de990d