https://gist.github.com/ProsperCraft/efaab6d5e40c34be23549d69cfe5d140

Modpack - Towncraft TWO for 1.16.5

It never generated a crash report, after this, it just locked up and I had to kill the process.

Seems that, for some reason, the crash is happening when trying to fetch the rift variant's blockSelector. Double check that your rifts.json is configured correctly.

Additionally, the latest.log may prove to be useful, as there may be some warnings or error printed to the console from YUNG's API when reading in the JSON config that may be of use.

I believe this particular crash was addressed in the v0.3.8 release. If the issue persists, please open a new report with a fresh crash report.

crash-2021-04-04_22.00.23-server.txt
Here is my Crash Report. Same issue, Engineer's Life 2 by Dreams
https://www.curseforge.com/minecraft/modpacks/engineers-life-2

@ProsperCraft In the future it is best to either supply the crash report, or a COMPLETE latest.log file. Snippets do not always catch the entire issue, as there might be issues elsewhere in the log that you aren't aware of that are related to the crash.