java.lang.NullPointerException: Unexpected error

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java.lang.NullPointerException: Unexpected error
at mca.core.MCA.getPlayerData(MCA.java:616)
at mca.client.gui.GuiSetup.(GuiSetup.java:58)
at mca.core.forge.GuiHandler.getClientGuiElement(GuiHandler.java:35)
at net.minecraftforge.fml.common.network.NetworkRegistry.getLocalGuiContainer(NetworkRegistry.java:266)
at mca.items.ItemCrystalBall.func_77659_a(ItemCrystalBall.java:55)
at net.minecraft.client.multiplayer.PlayerControllerMP.func_78769_a(PlayerControllerMP.java:438)
at net.minecraft.client.Minecraft.func_147121_ag(Minecraft.java:1519)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:2041)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1028)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:345)
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)

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