Version Information

Forge version: 35.0.15
Botania version: 1.16.3-409
curios-forge version: 1.16.4-4.0.2.1
Patchouli version: 1.16.2-47

Further Information

Link to crash log: Pastebin
Steps to reproduce:

1. Add Botania, Patchouli and Curios Forge in MultiMC for 1.16.4
2. Launch modpack
3. BOOM... crash

What I expected to happen:
For modpack to launch with only Botania :)
What happened instead:
Crash, see above pastebin link.

@shortybsd hey, can I confirm how you resolved this? Same issue!

Just an update, had to update my version of minecraft to resolve this; make sure you're running forge-35.1.7 (latest)