java.lang.NullPointerException: Exception ticking world
at buildcraft.energy.generation.OilGenerator.getStructures(OilGenerator.java:100)
at buildcraft.energy.generation.OilGenerator.generate(OilGenerator.java:68)
at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:167)
at micdoodle8.mods.galacticraft.core.TransformerHooks.otherModGenerate(TransformerHooks.java:184)
at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1018)
at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:997)
at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:157)
at net.minecraft.server.management.PlayerChunkMapEntry.func_187268_a(PlayerChunkMapEntry.java:126)
at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:147)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:227)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:754)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:666)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:524)
at java.lang.Thread.run(Thread.java:745)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Server thread
Stacktrace:
at buildcraft.energy.generation.OilGenerator.getStructures(OilGenerator.java:100)
at buildcraft.energy.generation.OilGenerator.generate(OilGenerator.java:68)
at net.minecraftforge.fml.common.registry.GameRegistry.generateWorld(GameRegistry.java:167)
at micdoodle8.mods.galacticraft.core.TransformerHooks.otherModGenerate(TransformerHooks.java:184)
at net.minecraft.world.chunk.Chunk.func_186034_a(Chunk.java:1018)
at net.minecraft.world.chunk.Chunk.func_186030_a(Chunk.java:997)
at net.minecraft.world.gen.ChunkProviderServer.func_186025_d(ChunkProviderServer.java:157)
at net.minecraft.server.management.PlayerChunkMapEntry.func_187268_a(PlayerChunkMapEntry.java:126)
at net.minecraft.server.management.PlayerChunkMap.func_72693_b(SourceFile:147)
at net.minecraft.world.WorldServer.func_72835_b(WorldServer.java:227)

https://pastebin.com/2CcdxjBJ

Incorrect Biome Setup.