Game crashes right after 9-10 secs have passed in atum. I have other 20 mods installed. I have already passed 1 month playing Atum 2 and nithing happened but recently the screen freezes and causing it a crash over and over again
latest.log
latest.log

just when I enter Atum dimension.

Game version : 1.16.5 forgeoptifine and latest Atum 2 version

There is a lot of Optifine errors, so that's most likely the cause here.

So what's the solution remove optifine or use older versions?

Try removing Optifine.

latest.log
it crashed again....This time there wasnt optifine

Okay, now there is actually an error caused by Atum :)

Can I play it with optifine somehow again?
And (sorry if I sound like dumb) what is the solution now....don't enter atum until next update?

Should be fine to play with Optifine :)
You probably sent me the wrong logs originally, is my best guess. As Atum was not mentioned at all, besides it loading up.
Yes, that's the "solution" for now.

crash-2021-06-07_20.08.13-server.txt
latest.log

I had almost the exact same issue in the past. Was biome ID layer 121 instead of 54 but aside from that was the same.
Was caused by having a mod that added a biome, atum somehow had that biome appear in Atum dimension so I removed that mod(Was voidscape beta from TF server), and then going in certain areas crashed the game with that msg in both the overworld and Atum. I had managed to fix it for the overworld by making a new world with same seed and only copying my base over with MCA selector, and then the issue only occured in Atum.
The Caused by: java.lang.IllegalStateException: Unknown biome id emitted by layers
thingie means a biome wasnt recoreded properly and then was removed I think, though it's odd how the error can occur in Atum dimension only even when issue is fixed for overworld

Which launcher are you using?

Tlauncher

That's quite unfortunate.

We offer no support for Tlauncher issues.