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I have 37 mods and as far as I know, they are all compatible. I was playing minecraft yesterday and it worked fine.

---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 7/5/14 11:45 AM
Description: Unexpected error

java.lang.IllegalStateException: Already tesselating!
at net.minecraft.client.renderer.Tessellator.func_78371_b(Tessellator.java:480)
at net.minecraft.client.renderer.Tessellator.func_78382_b(Tessellator.java:470)
at net.minecraft.client.renderer.RenderGlobal.func_72714_a(RenderGlobal.java:1295)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1443)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1119)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:946)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:838)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)


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

-- Head --
Stacktrace:
at net.minecraft.client.renderer.Tessellator.func_78371_b(Tessellator.java:480)
at net.minecraft.client.renderer.Tessellator.func_78382_b(Tessellator.java:470)
at net.minecraft.client.renderer.RenderGlobal.func_72714_a(RenderGlobal.java:1295)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1443)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [GCCorePlayerSP['meowzilla'/139, l='MpServer', x=835.96, y=65.62, z=204.92]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (697,64,-65), Chunk: (at 9,4,15 in 43,-5; contains blocks 688,0,-80 to 703,255,-65), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
Level time: 4499 game time, 4499 day time
Level dimension: 0
Level storage version: 0x00000 - Unknown?
Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 45 total; [EntityBat['Bat'/16562, l='MpServer', x=806.25, y=34.10, z=183.41], EntityBat['Bat'/16561, l='MpServer', x=790.28, y=31.00, z=183.63], EntityItem['item.tile.mushroom'/10398, l='MpServer', x=877.09, y=13.13, z=233.09], EntityFishy['Fishy'/9318, l='MpServer', x=915.03, y=58.88, z=124.94], EntityBat['Bat'/17579, l='MpServer', x=793.75, y=14.98, z=182.66], EntityItem['item.tile.gravel'/21271, l='MpServer', x=812.34, y=31.13, z=187.53], GCCorePlayerSP['meowzilla'/139, l='MpServer', x=835.96, y=65.62, z=204.92], EntityItem['item.tile.gravel'/21272, l='MpServer', x=812.22, y=31.13, z=189.97], EntityWaypointContainer['unknown'/145, l='MpServer', x=0.00, y=0.00, z=0.00], EntityBat['Bat'/14262, l='MpServer', x=786.03, y=41.00, z=157.69], EntityBat['Bat'/22920, l='MpServer', x=791.66, y=18.04, z=176.41], EntityBat['Bat'/22918, l='MpServer', x=791.75, y=18.00, z=167.47], EntityBat['Bat'/22919, l='MpServer', x=792.50, y=20.00, z=167.13], EntityBat['Bat'/22917, l='MpServer', x=795.63, y=20.00, z=163.44], EntityBat['Bat'/22915, l='MpServer', x=785.38, y=29.00, z=149.44], EntityBat['Bat'/14264, l='MpServer', x=813.25, y=31.10, z=204.50], EntityRog['Manta Ray'/15641, l='MpServer', x=869.63, y=59.16, z=192.19], EntityRog['Manta Ray'/15642, l='MpServer', x=871.19, y=60.00, z=190.06], EntityRog['Manta Ray'/15643, l='MpServer', x=872.38, y=59.84, z=189.03], EntityFishy['Fishy'/15644, l='MpServer', x=876.03, y=60.00, z=189.13], EntityPig['Pig'/10293, l='MpServer', x=843.50, y=63.00, z=226.19], EntityPig['Pig'/10292, l='MpServer', x=843.50, y=63.00, z=227.78], EntityBat['Bat'/16255, l='MpServer', x=813.41, y=25.10, z=211.47], EntityItem['item.tile.rail'/6801, l='MpServer', x=852.81, y=25.13, z=145.13], EntityItem['item.tile.rail'/6803, l='MpServer', x=851.38, y=25.13, z=145.38], EntityItem['item.tile.rail'/6798, l='MpServer', x=859.88, y=25.13, z=147.88], EntityItem['item.tile.gravel'/21156, l='MpServer', x=812.50, y=31.13, z=188.13], EntityItem['item.tile.mushroom'/10003, l='MpServer', x=881.13, y=14.13, z=211.88], EntityItem['item.tile.mushroom'/10002, l='MpServer', x=881.13, y=17.13, z=210.31], EntityItem['item.tile.mushroom'/8648, l='MpServer', x=782.88, y=23.13, z=172.13], EntityItem['item.tile.rail'/8650, l='MpServer', x=819.81, y=27.13, z=197.81], EntityFallingSand['Falling Block'/21619, l='MpServer', x=802.50, y=29.08, z=209.50], EntityItem['item.tile.gravel'/22119, l='MpServer', x=804.44, y=26.13, z=210.09], EntityItem['item.tile.gravel'/22141, l='MpServer', x=878.22, y=18.13, z=213.78], EntityBat['Bat'/17765, l='MpServer', x=798.53, y=43.11, z=165.25], EntityBat['Bat'/17766, l='MpServer', x=796.38, y=44.00, z=170.75], EntityBat['Bat'/17767, l='MpServer', x=791.53, y=44.00, z=179.28], EntityItem['item.tile.gravel'/22046, l='MpServer', x=802.81, y=30.13, z=203.50], EntityItem['item.tile.gravel'/22047, l='MpServer', x=803.47, y=26.13, z=204.78], EntityItem['item.tile.gravel'/22038, l='MpServer', x=796.78, y=30.13, z=203.75], EntityBat['Bat'/22055, l='MpServer', x=796.72, y=42.00, z=156.69], EntityItem['item.tile.rail'/9104, l='MpServer', x=793.81, y=30.13, z=201.13], EntityItem['item.tile.mushroom'/9105, l='MpServer', x=800.88, y=26.13, z=198.81], EntityItem['item.item.string'/9106, l='MpServer', x=799.88, y=27.88, z=207.88], EntityItem['item.item.string'/9103, l='MpServer', x=801.88, y=33.13, z=197.75]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:440)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2312)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:863)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

-- System Details --
Details:
Minecraft Version: 1.6.4
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_60, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 249119920 bytes (237 MB) / 1908932608 bytes (1820 MB) up to 1908932608 bytes (1820 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx2G
AABB Pool Size: 2 (112 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: FML and Forge are installed
IntCache: cache: 0, tcache: 0, allocated: 6, tallocated: 62
FML: MCP v8.11 FML v6.4.49.965 Minecraft Forge 9.11.1.965 Optifine OptiFine_1.6.4_HD_U_C6 37 mods loaded, 37 mods active
mcp{8.09} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{6.4.49.965} [Forge Mod Loader] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{9.11.1.965} [Minecraft Forge] (minecraftforge-9.11.1.965.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AppliedEnergistics-Core{rv14.finale3} [AppliedEnergistics Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Micdoodlecore{} [Micdoodle8 Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TooManyItems{1.6.4} [TooManyItems] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{2.9.2.4} [Damage Indicators] (1.6.4 DamageIndicatorsv2.9.2.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
LumberJack{1.6.4b} [LumberJack] ([1.6.4][c][forge]LumberJack.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AppliedEnergistics{rv14.finale3} [Applied Energistics] (appeng-rv14-finale3-mc16x.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.5.5} [BiblioCraft] (BiblioCraft[v1.5.5].zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Core{4.2.1} [BuildCraft] (buildcraft-A-1.6.4-4.2.1 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Builders{4.2.1} [BC Builders] (buildcraft-A-1.6.4-4.2.1 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Energy{4.2.1} [BC Energy] (buildcraft-A-1.6.4-4.2.1 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Factory{4.2.1} [BC Factory] (buildcraft-A-1.6.4-4.2.1 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Transport{4.2.1} [BC Transport] (buildcraft-A-1.6.4-4.2.1 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildCraft|Silicon{4.2.1} [BC Silicon] (buildcraft-A-1.6.4-4.2.1 (1).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ComputerCraft{1.63} [ComputerCraft] (ComputerCraft1.63.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ConfigMod{v1.0} [Extended Mod Config] (ConfigMod-for-MC-v1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoroAI{v1.0} [CoroAI] (CoroAI-for-MC-v1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
craftguide{1.5.2} [CraftGuide] (CraftGuide-1.6.7.5.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
dimdoors{1.6.4-R2.2.3} [Dimensional Doors] (DimensionalDoors-2.2.3-336.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtendedRenderer{v1.0} [Extended Renderer] (ExtendedRenderer-for-MC-v1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IC2{2.0.357-experimental} [IndustrialCraft 2] (industrialcraft-2_2.0.357-experimental.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GalacticraftCore{2.0.13} [Galacticraft Core] (Galacticraft-1.6.4-2.0.13.1063.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GalacticraftMars{2.0.13} [Galacticraft Mars] (Galacticraft-Planets-1.6.4-2.0.13.1063.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
IronChest{5.4.1.677} [Iron Chest] (ironchest-universal-1.6.4-5.4.1.677.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
numina{0.1.2-55} [Numina] (Numina-1.6.2-0.1.2-55.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
powersuits{0.10.0-91} [MachineMuse's Modular Powersuits] (ModularPowersuits-1.6.4-0.10.0-91.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Morph{0.7.1} [Morph] (Morph-Beta-0.7.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Natura{2.1.14} [Natura] (Natura_mc1.6.X_2.1.14.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Oceancraft{1.1} [Oceancraft Mod] (Oceancraft v1.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
powersuitaddons{@[email protected]} [Andrew's Modular Powersuits Addons] (powersuitaddons-1.6.4-877.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bau5_ProjectBench{1.8.0} [Project Bench] (ProjectBench-1.6.2-v1.8.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
TwilightForest{1.20.3} [The Twilight Forest] (twilightforest-1.20.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
AIBlock{v1.0} [AIBlock] (Weather-v1.58-Mod-for-MC-v1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
WeatherMod{1.58} [Weather and Tornadoes] (Weather-v1.58-Mod-for-MC-v1.6.2.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
mod_ZanMinimap{0.9.4} [Zan's Minimap] (ZansMinimap1.6.4.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.6.4-Forge9.11.1.965
LWJGL: 2.9.0
OpenGL: GeForce GTX 660/PCIe/SSE2 GL version 4.4.0, NVIDIA Corporation
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Pack: Default
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 27 (1512 bytes; 0 MB) allocated, 27 (1512 bytes; 0 MB) used

Thanks. Updating Optifine fixed it!

I'm having the same problem with a few of the same details, but I'm running Hexxit and it won't let me join servers. I can join single player worlds but servers just crash my game. I'm pretty sure that Hexxit doesn't have Optifine installed on it so I don't know how to fix it. If you need the full crash report then tell me if you can help at all.

We can help, but only if you make your own thread. It'll disturb the other users a bit too much if we do it here.