Enigmatica 2 Expert crash

[16:25:02] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.OutOfMemoryError: Java heap space
	at it.unimi.dsi.fastutil.ints.IntArrays.grow(IntArrays.java:263) ~[fastutil-7.1.0.jar:?]
	at it.unimi.dsi.fastutil.ints.IntArrayList.grow(IntArrayList.java:308) ~[fastutil-7.1.0.jar:?]
	at it.unimi.dsi.fastutil.ints.IntArrayList.add(IntArrayList.java:322) ~[fastutil-7.1.0.jar:?]
	at net.minecraft.client.util.SuffixArray.func_194057_a(SourceFile:43) ~[cgz.class:?]
	at net.minecraft.client.util.SearchTree.func_194041_a(SourceFile:49) ~[cgw.class:?]
	at net.minecraft.client.util.SearchTree$$Lambda$3157/1950406700.accept(Unknown Source) ~[?:?]
	at java.util.ArrayList.forEach(ArrayList.java:1249) ~[?:1.8.0_51]
	at net.minecraft.client.util.SearchTree.func_194042_b(SourceFile:49) ~[cgw.class:?]
	at net.minecraft.client.util.SearchTree.func_194043_a(SourceFile:44) ~[cgw.class:?]
	at net.minecraft.client.Minecraft$$Lambda$3151/25446065.accept(Unknown Source) ~[?:?]
	at java.lang.Iterable.forEach(Iterable.java:75) ~[?:1.8.0_51]
	at net.minecraft.client.Minecraft.func_193986_ar(Minecraft.java:590) ~[bib.class:?]
	at net.minecraftforge.fml.client.FMLClientHandler.reloadSearchTrees(FMLClientHandler.java:1086) ~[forge-1.12.2-14.23.5.2781.jar:?]
	at net.minecraftforge.fml.common.FMLCommonHandler.reloadSearchTrees(FMLCommonHandler.java:778) ~[forge-1.12.2-14.23.5.2781.jar:?]
	at net.minecraftforge.common.ForgeModContainer.mappingChanged(ForgeModContainer.java:581) ~[forge-1.12.2-14.23.5.2781.jar:?]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_51]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_51]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_51]
	at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_51]
	at com.google.common.eventbus.Subscriber.invokeSubscriberMethod(Subscriber.java:91) ~[guava-21.0.jar:?]
	at com.google.common.eventbus.Subscriber$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:219) ~[LoadController.class:?]
	at net.minecraftforge.fml.common.LoadController.propogateStateMessage(LoadController.java:197) ~[LoadController.class:?]
	at net.minecraftforge.fml.common.Loader.fireRemapEvent(Loader.java:924) ~[Loader.class:?]
	at net.minecraftforge.registries.GameData.injectSnapshot(GameData.java:711) ~[GameData.class:?]
	at net.minecraftforge.fml.common.FMLContainer.readData(FMLContainer.java:172) ~[FMLContainer.class:?]
	at net.minecraftforge.fml.common.FMLCommonHandler.handleWorldDataLoad(FMLCommonHandler.java:423) ~[FMLCommonHandler.class:?]
[16:25:02] [Server thread/ERROR]: This crash report has been saved to: D:\documents\Curse\Minecraft\Instances\Enigmatica 2 Expert\crash-reports\crash-2019-03-22_16.25.02-server.txt
[16:25:02] [Server thread/INFO]: Stopping server
[16:25:02] [Server thread/INFO]: Saving players
[16:25:02] [Server thread/INFO]: Saving worlds