With both Better End and C2ME installed, the server will crash once going to the end islands.

The dragon fight is fine, and the end runs normally until you travel to the end islands and a custom biome loads

Here's a crash report in case you need it

https://pastebin.com/raw/pisHcs8n

This issue has to be fixed on BetterEnd's side like paulevsGitch/BetterNether#477
I can do some work to fix and PR this in BetterEnd itself but it's going to be in low priority.

Having the same issue, however, i'm able to load SOME custom chunks before the crash (Here it happens while pregenning)
https://pastebin.com/fhqeT9jk
Removing C2ME fixes the issue.

Related to #97

better end is using vanilla generation so the dev can't fix anything on his own. here's what he said :

Due to logs I can conclude that game started chunk population before neighbor chunks are created, this should not happen in vanilla, and if someone implement chunk multithreading - it should be taken into account as features require to ask blocks in neighbor chunks

also maybe disabling the c2me chunkloading in the end is possible ? i really need this mod for my pack with terrablender and bclib :/

better end is using vanilla generation so the dev can't fix anything on his own. here's what he said :

Due to logs I can conclude that game started chunk population before neighbor chunks are created, this should not happen in vanilla, and if someone implement chunk multithreading - it should be taken into account as features require to ask blocks in neighbor chunks

also maybe disabling the c2me chunkloading in the end is possible ? i really need this mod for my pack with terrablender and bclib :/

I'm talking to the betterend dev and tell him how to fix it on their own. He don't really know what this issue actually is before.

It seems that in 0.2.0 alpha 6 and 6.1 it is able to load a few more chunks than in alpha 5 and will work for about 3 seconds, then it crashes again

seems to be fixed