When starting the game it crashes. It seems like a class is missing. Crash report:
crash-2021-05-20_12.18.20-fml.txt

After a lot of time I finally figured it out. The mod is working fine when using the current stable release of AE2. By using the current alpha (8.4.0-alpha.2) of AE2 it crashes. It says that it's an error of this mod while it is actually an error of compatibility between this mod and the alpha of AE2.

I'll wait until stable/beta is released then, I don't feel like compiling against an alpha only for it to break a week later

Can you give us a bit more info about what version we expect to work? I'm getting what appears to be the same error on version 8.3.1 which seems to be the current 'release' version.

that might explain it, I was running8.2.0 stable
I'll bump it to 8.3.1