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This exception has no message.
java.lang.NullPointerException at jds.bibliocraft.tileentities.BiblioLightTileEntity.writeCustomNBTData(BiblioLightTileEntity.java:51)[BiblioLightTileEntity.class:?] at jds.bibliocraft.tileentities.BiblioTileEntity.writeNBTData(BiblioTileEntity.java:468)[BiblioTileEntity.class:?] at jds.bibliocraft.tileentities.BiblioTileEntity.func_145841_b(BiblioTileEntity.java:436)[BiblioTileEntity.class:?] at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75820_a(AnvilChunkLoader.java:368)[anj.class:?] at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75816_a(AnvilChunkLoader.java:165)[anj.class:?] at net.minecraft.world.gen.ChunkProviderServer.func_73242_b(ChunkProviderServer.java:238)[ld.class:?] at net.minecraft.world.gen.ChunkProviderServer.func_73151_a(ChunkProviderServer.java:298)[ld.class:?] at net.minecraft.world.WorldServer.func_73044_a(WorldServer.java:905)[le.class:?] at net.minecraft.server.MinecraftServer.func_71267_a(MinecraftServer.java:366)[MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:628)[MinecraftServer.class:?] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:481)[MinecraftServer.class:?] at java.lang.Thread.run(Thread.java:745)[?:1.8.0_45-internal]