Direwolf20 1.12.2 Client Side crash

@KillTyrant wrote:

I get this client-side crash every so often when I access my Refined Storage Crafting grid. Im not savvy by any measure nor can I really read and break down what the cause is, so if someone can point me in the right direction to understand what is going on I would highly appreciate it.

[17:31:13] [main/FATAL]: Error executing task
java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
at java.util.concurrent.FutureTask.report(Unknown Source) ~[?:1.8.0_171]
at java.util.concurrent.FutureTask.get(Unknown Source) ~[?:1.8.0_171]
at net.minecraft.util.Util.func_181617_a(SourceFile:47) [h.class:?]
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1086) [bib.class:?]
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:397) [bib.class:?]
at net.minecraft.client.main.Main.main(SourceFile:123) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_171]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_171]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_171]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_171]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
Caused by: java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.remove(Unknown Source) ~[?:1.8.0_171]
at java.util.AbstractList.removeRange(Unknown Source) ~[?:1.8.0_171]
at java.util.AbstractList.clear(Unknown Source) ~[?:1.8.0_171]
at net.minecraft.util.NonNullList.clear(SourceFile:74) ~[fi.class:?]
at com.raoulvdberge.refinedstorage.container.ContainerGrid.initSlots(ContainerGrid.java:46) ~[ContainerGrid.class:?]
at com.raoulvdberge.refinedstorage.gui.grid.GuiGrid.init(GuiGrid.java:124) ~[GuiGrid.class:?]
at com.raoulvdberge.refinedstorage.gui.GuiBase.func_73866_w_(GuiBase.java:95) ~[GuiBase.class:?]
at net.minecraft.client.gui.GuiScreen.func_146280_a(GuiScreen.java:478) ~[blk.class:?]
at net.minecraft.client.Minecraft.func_147108_a(Minecraft.java:1016) ~[bib.class:?]
at net.minecraftforge.fml.client.FMLClientHandler.showGuiScreen(FMLClientHandler.java:534) ~[FMLClientHandler.class:?]
at net.minecraftforge.fml.common.FMLCommonHandler.showGuiScreen(FMLCommonHandler.java:321) ~[FMLCommonHandler.class:?]
at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:111) ~[FMLNetworkHandler.class:?]
at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2550) ~[aed.class:?]
at net.minecraftforge.fml.common.network.internal.OpenGuiHandler.process(OpenGuiHandler.java:50) ~[OpenGuiHandler.class:?]
at net.minecraftforge.fml.common.network.internal.OpenGuiHandler.lambda$channelRead0$0(OpenGuiHandler.java:43) ~[OpenGuiHandler.class:?]
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) ~[?:1.8.0_171]
at java.util.concurrent.FutureTask.run(Unknown Source) ~[?:1.8.0_171]
at net.minecraft.util.Util.func_181617_a(SourceFile:46) ~[h.class:?]
… 9 more

P.S

Sorry if this is the wrong format. I tried looking for a thread that explained how to properly post something on these forums and my search came up empty.

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