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via GitHub by Tupas1
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This exception has no message.
java.lang.NullPointerException: 	at gregtech.common.blocks.GT_Block_GeneratedOres.setOreBlock(GT_Block_GeneratedOres.java:106)	at gregtech.common.GT_Worldgen_GT_Ore_SmallPieces.executeWorldgen(GT_Worldgen_GT_Ore_SmallPieces.java:57)	at gregtech.common.GT_Worldgenerator.generateInternal(GT_Worldgenerator.java:95)	at gregtech.common.GT_Worldgenerator.generate(GT_Worldgenerator.java:54)	at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:120)	at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1001)	at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:983)	at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:154)	at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:298)	at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:106)	at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:120)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:431)	at java.lang.Thread.run(Thread.java:745)