Hey I unhappily detected a bug that makes the mod unplayable. The ender shards aren't craftable! You can't heat up an ender eye in a furnace in order to obtain a ender shard.
I hope you fix your last version for mc1.12.

Oops!

This has been fixed
https://minecraft.curseforge.com/projects/simple-teleporters/files/2512726

Cool! ;)