java.lang.NullPointerException: Unexpected error

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java.lang.NullPointerException: Unexpected error
at mca.core.MCA.getPlayerData(
at mca.client.gui.GuiSetup.(
at mca.core.forge.GuiHandler.getClientGuiElement(
at mca.items.ItemCrystalBall.func_77659_a(
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78769_a(
at net.minecraft.client.Minecraft.func_147121_ag(
at net.minecraft.client.Minecraft.func_71407_l(
at net.minecraft.client.Minecraft.func_71411_J(
at net.minecraft.client.Minecraft.func_99999_d(
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(
at sun.reflect.DelegatingMethodAccessorImpl.invoke(
at java.lang.reflect.Method.invoke(
at net.minecraft.launchwrapper.Launch.launch(

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