Terrain Control Snapshot Error Log

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[01:06:00] [Server thread/INFO] [TerrainControl]: Loading configs for world "world"....
[01:06:17] [Server thread/INFO] [TerrainControl]: 1678 world custom objects loaded.
[01:06:18] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException
	at java.lang.Class.isAssignableFrom(Native Method) ~[?:1.8.0_31]
	at com.khorn.terraincontrol.forge.util.MobSpawnGroupHelper.toMinecraftClass(MobSpawnGroupHelper.java:119) ~[MobSpawnGroupHelper.class:?]
	at com.khorn.terraincontrol.forge.util.MobSpawnGroupHelper.toMinecraftlist(MobSpawnGroupHelper.java:95) ~[MobSpawnGroupHelper.class:?]
	at com.khorn.terraincontrol.forge.generator.TXBiome.addMobs(TXBiome.java:107) ~[TXBiome.class:?]
	at com.khorn.terraincontrol.forge.generator.TXBiome.<init>(TXBiome.java:97) ~[TXBiome.class:?]
	at com.khorn.terraincontrol.forge.generator.TXBiome.getOrCreateBiome(TXBiome.java:77) ~[TXBiome.class:?]
	at com.khorn.terraincontrol.forge.ForgeWorld.createBiomeFor(ForgeWorld.java:101) ~[ForgeWorld.class:?]
	at com.khorn.terraincontrol.configuration.ServerConfigProvider.indexSettings(ServerConfigProvider.java:288) ~[ServerConfigProvider.class:?]
	at com.khorn.terraincontrol.configuration.ServerConfigProvider.loadBiomes(ServerConfigProvider.java:162) ~[ServerConfigProvider.class:?]
	at com.khorn.terraincontrol.configuration.ServerConfigProvider.loadSettings(ServerConfigProvider.java:91) ~[ServerConfigProvider.class:?]
	at com.khorn.terraincontrol.configuration.ServerConfigProvider.<init>(ServerConfigProvider.java:78) ~[ServerConfigProvider.class:?]
	at com.khorn.terraincontrol.forge.WorldLoader.demandServerWorld(WorldLoader.java:136) ~[WorldLoader.class:?]
	at com.khorn.terraincontrol.forge.TXWorldType.getBiomeProvider(TXWorldType.java:49) ~[TXWorldType.class:?]
	at net.minecraft.world.WorldProvider.func_76572_b(WorldProvider.java:56) ~[atl.class:?]
	at net.minecraft.world.WorldProvider.func_76558_a(WorldProvider.java:39) ~[atl.class:?]
	at net.minecraft.world.WorldServer.<init>(WorldServer.java:113) ~[ls.class:?]
	at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:85) ~[bzl.class:?]
	at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:120) ~[bzl.class:?]
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:431) [MinecraftServer.class:?]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_31]
[01:06:18] [Server thread/ERROR]: This crash report has been saved to: /Users/Sgrt./Desktop/Minecraft/ftb/FTBPresentsHermitPack/minecraft/crash-reports/crash-2017-01-22_01.06.18-server.txt
[01:06:18] [Server thread/INFO]: Stopping server
[01:06:18] [Server thread/INFO]: Saving players
[01:06:18] [Server thread/INFO]: Saving worlds
[01:06:18] [Server thread/INFO] [FML]: Applying holder lookups
[01:06:18] [Server thread/INFO] [FML]: Holder lookups applied
[01:06:18] [Server thread/INFO] [FML]: The state engine was in incorrect state SERVER_STARTING and forced into state SERVER_STOPPED. Errors may have been discarded.