I'm not making a mod but a modpack and I cannot find anywhere for any kind of support on the issue I am having, I have started working on a modpack and I got to the stage of trying to test it just to see if it was playable at all (modpack in question https://www.curseforge.com/minecraft/modpacks/funkycraft/files) 

I am able to run the modded version of the game and make a world but around the 5 minute mark of running the world the game crashes and I get an crash message that looks like this; 

The game crashed whilst exception ticking world Error: java.util.ConcurrentModificationException: null Exit Code: -1

I get this everytime without fail and I have no idea what is causing it at all, and when I open the crash report this is what I get too;

-- Head --
Thread: Server thread
Stacktrace:
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380) ~[?:1.8.0_51] {}
    at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512) ~[?:1.8.0_51] {}
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502) ~[?:1.8.0_51] {}
    at java.util.stream.StreamSpliterators$WrappingSpliterator.forEachRemaining(StreamSpliterators.java:312) ~[?:1.8.0_51] {}
    at java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:743) ~[?:1.8.0_51] {}
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:580) ~[?:1.8.0_51] {}
    at net.minecraft.world.IServerWorld.func_242417_l(SourceFile:11) ~[?:?] {re:computing_frames,re:mixin,re:classloading}
    at net.minecraft.world.spawner.WorldEntitySpawner.func_234966_a_(WorldEntitySpawner.java:178) ~[?:?] {re:classloading}
    at net.minecraft.world.spawner.WorldEntitySpawner.func_234967_a_(WorldEntitySpawner.java:124) ~[?:?] {re:classloading}
    at net.minecraft.world.spawner.WorldEntitySpawner.func_234979_a_(WorldEntitySpawner.java:110) ~[?:?] {re:classloading}
    at net.minecraft.world.server.ServerChunkProvider.func_241099_a_(ServerChunkProvider.java:364) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterweather.mixins.json:access.ServerChunkProviderAccess,pl:mixin:A}
    at net.minecraft.world.server.ServerChunkProvider$$Lambda$45518/826919408.accept(Unknown Source) ~[?:?] {}
    at java.util.ArrayList.forEach(ArrayList.java:1249) ~[?:1.8.0_51] {}
    at net.minecraft.world.server.ServerChunkProvider.func_217220_m(ServerChunkProvider.java:351) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterweather.mixins.json:access.ServerChunkProviderAccess,pl:mixin:A}
    at net.minecraft.world.server.ServerChunkProvider.func_217207_a(ServerChunkProvider.java:326) ~[?:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:betterweather.mixins.json:access.ServerChunkProviderAccess,pl:mixin:A}
    at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:333) ~[?:?] {re:mixin,pl:accesstransformer:B,xf:fml:forgeendertech:coremod,re:classloading,pl:accesstransformer:B,xf:fml:forgeendertech:coremod,pl:mixin:APP:betternether.mixins.json:ServerWorldMixin,pl:mixin:APP:cavesandcliffs.mixins.json:common.world.gen.ServerWorldMixin,pl:mixin:APP:betterweather.mixins.json:access.ServerWorldAccess,pl:mixin:APP:betterweather.mixins.json:server.world.MixinServerWorld,pl:mixin:APP:bountifulbaubles.mixins.json:MixinServerWorld,pl:mixin:APP:immersiveengineering.mixins.json:coremods.ServerWorldMixin,pl:mixin:APP:abnormals_core.mixins.json:ServerWorldMixin,pl:mixin:APP:quark.mixins.json:ServerWorldMixin,pl:mixin:A}
 

I have no idea what is going on and any help would be great! I don't know what is causing this and how to fix it I am at a dead end!

1 hour ago, diesieben07 said:

Post the debug.log.

Just looking for it

1 hour ago, diesieben07 said:

Post the debug.log.

20:03:57.861

Prepared asset index

20:03:58.213

Have 2662 total files to check or download

20:03:59.584

Nothing to download!

20:03:59.584

Downloading Java Runtime jre-legacy:8u51

20:03:59.659

Extracting 8 files! 

 

not entirely sure if this is the right thing, if not just let me know and I can keep looking.

that's not the full debug log

1 minute ago, Luis_ST said:

that's not the full debug log

Under levels should I have everything ticked I only had Debug ticked but I can have Debug, Info, Warn, Error and fatal.

what are you talking about?

6 minutes ago, Luis_ST said:

what are you talking about?

In the Minecraft Output Menu tab I opened I have the option to show different things as I said before but I dont know what else counts as the debug log.

6 minutes ago, diesieben07 said:

The debug.log is a file from the logs folder.

right let me look for you, sorry for the confusion. I'm very new to this.

 

21 minutes ago, diesieben07 said:

The debug.log is a file from the logs folder.

This should be the debug log https://gist.github.com/smolsmeeep/e365f71d977b606546b390e9ada42a05

18 minutes ago, diesieben07 said:

Unfortunately this error could literally be any of the mods. 

I see that is annoying, I guess it's just time to test everyone of them

you can use Binary Search to find the Mod which cause the crash

10 hours ago, Luis_ST said:

you can use Binary Search to find the Mod which cause the crash

Whats binary search? How would I go about doing that?

The binary search is a way of finding a faulty thing among a lot of other things, without having to remove the things one-by-one.

This is useful for finding a broken mod among hundreds of mods, without having to spend time testing the mods one-by-one.

The procedure is simple:

1. Remove half of the existing things, and put them aside.
2. Run the program / game.
3. Does the issue still exist?
   If YES: Repeat from step 1 with the current things.
   IF NO: Swap out the current things with the ones set aside, and repeat from step 1.
4. Repeat this process until the problematic thing/s have been found.

From Forge Discord Bot

Edited April 3, 20223 yr by Luis_ST