Minecraft: 1.12.2
Forge: 14.23.1.2556
VanillaTweaks: 1.1.9

When I try to launch the client, I get this crash:

Crash Report: https://pastebin.com/raw/BASwkfWr

Thought maybe it was an incompatibility, but stripped an instance down to just vt, and forge, and still getting the same thing. 1.1.8 seems to work just fine, for me.

Thanks for your time and consideration, and best of luck. Lovin the mod.

fml-client-latest.log?

https://pastebin.com/raw/sixdpmSs

Did you enable the debug option in twitch/curse launcher try disabling it and run the game

Can I get the log . Thanks for the nice words

i am having the same error on launch.
i have been looking in curse launcher, but i cannot find an debug option there.
although my forge is older: 14.23.0.2544

what strikes me as odd is this:
~[vt$RegsitrationHandler.class:?]
possibly an typo ;-)
also that class might not exist as you define that class inside vt.java
you might consider moving it to its own java file so it gets an .class file on compiling it.
i learned never to put more then 1 class in a .java file.
but as your 1.18 version also does work for me this might be unrelated.

Sorry for the delay. I'm looking around in the Twitch App Settings and not finding a "Debug Setting", what sub section would it be in?

Closes with f85f72d

Will be available on CurseForge once approved