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On my friends pixelmon server I crash from opening chests. i am opped and i have tried moving out of worldguard areas, i have had my data deleted but i still keep crashing. I have also looked through the crash log but don't really understand, i will post what i think might hold the reason but if the crash log i post doesn't tell you why then let me know.

Crash Log:

Description: Unexpected error

java.lang.IndexOutOfBoundsException: Index: 45, Size: 45
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at net.minecraft.inventory.Container.func_75139_a(SourceFile:104)
at net.minecraft.inventory.Container.func_75131_a(SourceFile:390)
at net.minecraft.client.network.NetHandlerPlayClient.func_147241_a(NetHandlerPlayClient.java:1058)
at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:49)
at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:11)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:273)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1602)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:973)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:898)
at net.minecraft.client.main.Main.main(SourceFile:148)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Head --
Stacktrace:
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at net.minecraft.inventory.Container.func_75139_a(SourceFile:104)
at net.minecraft.inventory.Container.func_75131_a(SourceFile:390)
at net.minecraft.client.network.NetHandlerPlayClient.func_147241_a(NetHandlerPlayClient.java:1058)
at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:49)
at net.minecraft.network.play.server.S30PacketWindowItems.func_148833_a(SourceFile:11)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78765_e(PlayerControllerMP.java:273)