CC:T 1.91.1 (the release from a couple hours ago) on 1.16.2 with Loader 0.9.3 build 207 and API 0.20.1 build 401 will not generate a world or load an existing one.
https://paste.ee/p/CP3UA

• 1.16.2
• CC: Tweaked version 1.91.1

I forgot to mention that this occurs with Java 8 and 14. The log for 14 is in the original report, this is the log for 8: https://paste.ee/p/gSEsc

I think that's my fault, will fix ina bit

ok now just wait for zundrel to push a released, fixed
e1b8ac1