IMPORTANT: UC no longer supports numeric IDs for materials. You may need to fix your config manually for this change. When referencing materials, use the names listed here, no matter the server version: https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Material.html

Patch notes can be found here.

Huge thanks to @Datatags for this update. It was almost entirely done by him. Also thanks to Chris6ix and DartPower for their contribution.