Hi, could you please check it up? It says there is some problem. The game is crushing when i try do enter my world. Previously all was good - everything was working, but after some time, i started to see crashes.

There is link to the log minecraft gave me.
https://bytebin.lucko.me/atYrZtG8m4

Creator of Better Combat said it:

"JustLeveling is causing the crashes as it is trying to modify the code of Better Combat, which is unsafe, and it fails doing so.
Remove JustLeveling.
I cannot do anything to resolve this problem besides adding explicit incompatibility flag"

Full log, if you need it.
latest (1).log

I tried to add requied levels for weapons of better combat and its addon. Like weapon need 6 strength or luck. Is this the problem?

Same here ! Here is the crash report it gave me, maybe this will help
crash-2024-06-24_14.17.52-client.txt

Here is the discussion I had with the better combat dev
ZsoltMolnarrr/BetterCombat#376
From his perspective, this can be fixed on Just Levelling side