Fabric build not building (Snapshot - MC1.16.3)

As far as I can tell, it's an MCreator bug so I'll post it here.

I got a build error while trying to make a simple emerald pickaxe:

https://pastebin.com/KqR8ByF1

I don't have any additional information other than I'm using this model of MacBook Air for this: https://everymac.com/systems/apple/macbook-air/specs/macbook-air-core-i…

Thanks!

-jaden-