java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at gregtechmod.common.blocks.GT_BlockMetaID_Ore.m(GT_BlockMetaID_Ore.java:68)
at ic2.common.TileEntityMiner.canMine(TileEntityMiner.java:540)
at ic2.common.TileEntityMiner.aquireTarget(TileEntityMiner.java:418)
at ic2.common.TileEntityMiner.mine(TileEntityMiner.java:161)
at ic2.common.TileEntityMiner.g(TileEntityMiner.java:60)
at undefined.up.h(World.java:1814)
at undefined.gr.h(WorldServer.java:433)
at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:644)
at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:575)
at undefined.axv.p(IntegratedServer.java:105)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)
at undefined.ep.run(SourceFile:539)

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