Minecraft crash report

---- Minecraft Crash Report ----

WARNING: coremods are present:
  ThaumcraftLoader (Thaumcraft-1.8.9-5.2.4.jar)
  FMLPlugin (InventoryTweaks-1.60-40.jar)
Contact their authors BEFORE contacting forge

// Ouch. That hurt :(

Time: 5/23/17 6:13 PM
Description: Exception in server tick loop

java.lang.RuntimeException: Already decorating
	at net.minecraft.world.biome.BiomeDecorator.func_180292_a(BiomeDecorator.java:71)
	at net.minecraft.world.biome.BiomeGenBase.func_180624_a(BiomeGenBase.java:343)
	at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:453)
	at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:261)
	at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1081)
	at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:172)
	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:114)
	at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:84)
	at net.minecraft.world.gen.ChunkProviderServer.func_73154_d(ChunkProviderServer.java:181)
	at net.minecraft.world.World.func_72964_e(World.java:287)
	at net.minecraft.world.World.func_175726_f(World.java:282)
	at net.minecraft.world.World.func_180501_a(World.java:302)
	at main.java.blahblahbal.blahmod.world.WorldGenDifferentPalmTree.placeBlock(WorldGenDifferentPalmTree.java:223)
	at main.java.blahblahbal.blahmod.world.WorldGenDifferentPalmTree.buildLayer(WorldGenDifferentPalmTree.java:209)
	at main.java.blahblahbal.blahmod.world.WorldGenDifferentPalmTree.func_180709_b(WorldGenDifferentPalmTree.java:190)
	at net.minecraft.world.biome.BiomeDecorator.func_150513_a(BiomeDecorator.java:151)
	at net.minecraft.world.biome.BiomeDecorator.func_180292_a(BiomeDecorator.java:100)
	at net.minecraft.world.biome.BiomeGenBase.func_180624_a(BiomeGenBase.java:343)
	at net.minecraft.world.gen.ChunkProviderGenerate.func_73153_a(ChunkProviderGenerate.java:453)
	at net.minecraft.world.gen.ChunkProviderServer.func_73153_a(ChunkProviderServer.java:261)
	at net.minecraft.world.chunk.Chunk.func_76624_a(Chunk.java:1081)
	at net.minecraft.world.gen.ChunkProviderServer.originalLoadChunk(ChunkProviderServer.java:172)
	at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:114)
	at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:84)
	at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:307)
	at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:109)
	at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:123)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:441)
	at java.lang.Thread.run(Thread.java:745)


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

-- System Details --
Details:
	Minecraft Version: 1.8.9
	Operating System: Windows 8.1 (amd64) version 6.3
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 438662520 bytes (418 MB) / 764411904 bytes (729 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	FML: Minecraft 1.8.9 MCP 9.19 Powered by Forge 11.15.1.1855 17 mods loaded, 17 mods active
	States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
	UCHIJAA	mcp{9.19} [Minecraft Coder Pack] (minecraft.jar)
	UCHIJAA	FML{8.0.99.99} [Forge Mod Loader] (forge-1.8.9-11.15.1.1855.jar)
	UCHIJAA	Forge{11.15.1.1855} [Minecraft Forge] (forge-1.8.9-11.15.1.1855.jar)
	UCHIJAA	net.minecraft.scalar.cutall.mod_CutAllSMP{2.5.0} [CutAllSMP] ([1.8.9][forge1742]mod_CutAllSMP_v2.5.0.jar)
	UCHIJAA	backpack{3.0.1} [Backpack] (backpack-3.0.1-1.8.9.jar)
	UCHIJAA	BiomesOPlenty{3.0.0} [Biomes O' Plenty] (BiomesOPlenty-1.8.9-3.0.0.2001-universal.jar)
	UCHIJAA	blahmod{1.0.0} [Blah's Mod] (BlahMod-1.0.0.jar)
	UCHIJAA	inventorytweaks{1.60-40-e06e29a} [Inventory Tweaks] (InventoryTweaks-1.60-40.jar)
	UCHIJAA	IronChest{6.0.115.759} [Iron Chest] (Iron-Chests-Mod-1.8.9.jar)
	UCHIJAA	JEI{2.28.16.184} [Just Enough Items] (jei_1.8.9-2.28.16.184.jar)
	UCHIJAA	ProjectE{1.8.9-PE1.1.3} [ProjectE] (ProjectE-Mod-1.8.9.jar)
	UCHIJAA	Baubles{1.1.3.0} [Baubles] (Baubles-1.8.9-1.1.3.0.jar)
	UCHIJAA	Thaumcraft{5.2.4} [Thaumcraft] (Thaumcraft-1.8.9-5.2.4.jar)
	UCHIJAA	Waila{1.6.0} [Waila] (Waila-1.6.0-B3_1.8.8.jar)
	UCHIJAA	wawla{1.1.4.168} [What Are We Looking At] (Wawla-1.8.9-1.1.4.171.jar)
	UCHIJAA	worldedit{6.1.1} [WorldEdit] (worldedit-forge-mc1.8.9-6.1.1.jar)
	UCHIJAA	XaeroMinimap{1.7.9.1} [Xaero's Minimap] (xaeros_minimap_v1.7.9.1_Forge_1.8.9.jar)
	Loaded coremods (and transformers):
ThaumcraftLoader (Thaumcraft-1.8.9-5.2.4.jar)

FMLPlugin (InventoryTweaks-1.60-40.jar)
  invtweaks.forge.asm.ContainerTransformer
	GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
	Profiler Position: N/A (disabled)
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Definitely; Client brand changed to 'fml,forge'