https://pastebin.com/xB4D8RyJ

Trying to slowly build my 1.12.1 port of my own pack, ran into this error.

Please update, this has already been fixed in 1.1.1 :)

Sorry, twitch is giving me some issues with telling me when a mod has been updated.

While Twitch is indeed having issues, was this update marked as 1.12.1 compatible? I'm not receiving any indicators to update.

It was, 1.1.2 is the latest approved one and marked appropriately: https://minecraft.curseforge.com/projects/bedrockores/files
I'll push a minor update in a bit (for #28), maybe that'll fix it on their end.