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via GitHub by LukeTan1248
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net.minecraft.block.BlockAir cannot be cast to ic2.core.block.BlockMultiID
java.lang.ClassCastException: net.minecraft.block.BlockAir cannot be cast to ic2.core.block.BlockMultiID	at ic2.core.block.OverlayTesr.func_147500_a(OverlayTesr.java:19)	at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147549_a(SourceFile:100)	at net.minecraft.client.renderer.tileentity.TileEntityRendererDispatcher.func_147544_a(SourceFile:92)	at net.minecraft.client.renderer.RenderGlobal.func_147589_a(RenderGlobal.java:483)	at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1224)	at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1011)	at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1001)	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(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)	at net.minecraft.launchwrapper.Launch.main(Launch.java:28)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)	at java.lang.reflect.Method.invoke(Unknown Source)	at info.mineshafter.GameStarter.main(GameStarter.java:24)