Exception in server tick loop...
Cavern: 2.1.8
Minecraft: 1.12.2
Forge: 2795

I have the same probleme please help me

Me too. I can't play with the mod installed at all until it's fixed.

Between me and a helpful fellow forge user, the issue has been narrowed down a bit. The mod works fine on it's own, but with more mods it seems to crash. It comes down to an ore dictionary conflict but we've yet to work out which entry or mod causes the issue. I don't know much about the ore dictionary coding stuff.

My issue has narrowed down to CoFH Core/and CoFH World. Not sure why, maybe because CoFH likes to control ore generation?

[11:58:42] [Server thread/ERROR] [FML]: A fatal exception occurred during the server starting event
net.minecraftforge.fml.common.LoaderExceptionModCrash: Caught exception from Cavern II (cavern)

Caused by: java.lang.StringIndexOutOfBoundsException: String index out of range: 4
at java.lang.String.charAt(Unknown Source) ~[?:1.8.0_191]
at cavern.block.RandomiteHelper.refreshItems(RandomiteHelper.java:45) ~[RandomiteHelper.class:?]
at cavern.core.Cavern.onServerStarting(Cavern.java:339) ~[Cavern.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
at net.minecraftforge.fml.common.FMLModContainer.handleModStateEvent(FMLModContainer.java:624) ~[forge-1.12.2-14.23.5.2768-universal.jar:?]
at sun.reflect.GeneratedMethodAccessor8.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
at net.minecraftforge.fml.common.LoadController.sendEventToModContainer(LoadController.java:218) ~[forge-1.12.2-14.23.5.2768-universal.jar:?]
at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:196) ~[forge-1.12.2-14.23.5.2768-universal.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_191]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_191]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_191]
at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Subscriber$SynchronizedSubscriber.invokeSubscriberMethod(Subscriber.java:150) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Subscriber$1.run(Subscriber.java:76) ~[guava-21.0.jar:?]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutor.execute(MoreExecutors.java:399) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Subscriber.dispatchEvent(Subscriber.java:71) ~[guava-21.0.jar:?]
at com.google.common.eventbus.Dispatcher$PerThreadQueuedDispatcher.dispatch(Dispatcher.java:116) ~[guava-21.0.jar:?]
at com.google.common.eventbus.EventBus.post(EventBus.java:217) ~[guava-21.0.jar:?]
at net.minecraftforge.fml.common.LoadController.distributeStateMessage(LoadController.java:135) ~[LoadController.class:?]
at net.minecraftforge.fml.common.Loader.serverStarting(Loader.java:794) [Loader.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.handleServerStarting(FMLCommonHandler.java:297) [FMLCommonHandler.class:?]
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:158) [chd.class:?]
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486) [MinecraftServer.class:?]

This issue is expired