The game crashed when initializing. I have temporarily removed the AdvSolarPatch mod and it successfully loads the game without any errors.

Crash report: https://pastebin.com/5FeE0Qan
Log file: https://pastebin.com/48MxxyS5

Forge version: 1.12.2-forge-14.23.5.2847
ic2 version: 2.8.221-ex112
AdvSolarPatch version: 1.2
Java version: 1.8.0_291

Can't reproduce the issue myself, but I pushed a possible fix. Can you try building and running the latest commit?

Looks like the mod can't load the metadata file for some reason.

Can't reproduce the issue myself, but I pushed a possible fix. Can you try building and running the latest commit?

Thank you for your update. I have built it and tested it. It runs successfully without any errors.