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or see https://forum.feed-the-beast.com/threads/how-to-create-minecraft-server-on-curse.160979/#post-1694204

How your server is running cauldron if you did not modify the pack?

Total 16 GB should be ok. And for powerusers increase from 8 GB to 16 GB never hurts.

Actually no. That exception is thrown when data structure is used misused. See https://docs.oracle.com/javase/7/docs/api/java/util/ConcurrentModificationException.html for references.

Can you hit upload log button and give us link to see which JVM is working and which is not.

Reinstall server and make sure you have all libraries

Update your GPU drivers

How about that creeper head in left side icon column?

And why there is client side mods in server?

Update your GPU drivers.

Log would be nice.

https://github.com/Slowpoke101/FTBLaunch/commits/master

Well, correct way to debug is to test which build created the issue. See https://ftb.cursecdn.com/FTB2/maven/net/ftb/FTB_Launcher/ for build. Problem happened somewhere between builds 1.4.12-388 and 1.4.13-408. Most obvious change was reverted with release of 1.4.14. With binary search it should...

Did you try without optifine?

Three months? Broken driver was released 20170120 ;) And multiple reddit/twitter posts were done as soon as culprit was found.

What are C:\WINDOWS\AppPatch\AppPatch64\AcLayers.DLL, C:\Program Files (x86)\RivaTuner Statistics Server\RTSSHooks64.dll and C:\Program Files (x86)\LG Electronics\OnScreen Control\bin\ScreenSplitterHook64.dll? Are they somehow changing d3d9.dll calls?

Or #FTB in espernet. IRC channel might have more users who can assist with binary search to find out offending commit. You can also ping me in IRC(nick IoP) or Curse.

Do you have notes about version you updated from and to?

try http://ftb.cursecdn.com/FTB2/maven/net/ftb/FTB_Launcher/1.4.14-409/FTB_Launcher-1.4.14-409.jar