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I run my own server and when I go on, it lags mad hard then stops running. Here is the error message I got.
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---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 5/22/13 7:40 PM
Description: Rendering entity in world

java.lang.IllegalStateException: Already tesselating!
at bgd.b(Tessellator.java:481)
at bgd.b(Tessellator.java:471)
at bgf.a(RenderBlocks.java:8919)
at bhi.a(RenderItem.java:106)
at bhi.a(RenderItem.java:578)
at bgy.a(RenderManager.java:225)
at bgy.a(RenderManager.java:194)
at bfy.a(RenderGlobal.java:495)
at bfq.a(EntityRenderer.java:1594)
at bfq.b(EntityRenderer.java:1121)
at EntityRendererProxy.b(EntityRendererProxy.java:20)
at net.minecraft.client.Minecraft.K(SourceFile:597)
at net.minecraft.client.Minecraft.run(SourceFile:526)
at java.lang.Thread.run(Unknown Source)


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

-- Head --
Stacktrace:
at bgd.b(Tessellator.java:481)
at bgd.b(Tessellator.java:471)
at bgf.a(RenderBlocks.java:8919)
at bhi.a(RenderItem.java:106)
at bhi.a(RenderItem.java:578)

-- Entity being rendered --
Details:
Entity Type: Item (rh)
Entity ID: 1031
Entity Name: item.tile.stonebrick
Entity's Exact location: -564.44, 11.50, 300.13
Entity's Block location: World: (-565,11,300), Chunk: (at 11,0,12 in -36,18; contains blocks -576,0,288 to -561,255,303), Region: (-2,0; contains chunks -64,0 to -33,31, blocks -1024,0,0 to -513,255,511)
Entity's Momentum: -0.00, -0.29, 0.00

-- Renderer details --
Details:
Assigned renderer: [email protected]
Location: -0.76,-1.01,-0.38 - World: (-1,-2,-1), Chunk: (at 15,-1,15 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Rotation: -161.71875
Delta: 0.6352675
Stacktrace:
at bgy.a(RenderManager.java:225)
at bgy.a(RenderManager.java:194)
at bfy.a(RenderGlobal.java:495)
at bfq.a(EntityRenderer.java:1594)
at bfq.b(EntityRenderer.java:1121)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [bdv['Tripl3j547'/162, l='MpServer', x=-563.68, y=12.62, z=300.51]]
Chunk stats: MultiplayerChunkCache: 441
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (-232,64,228), Chunk: (at 8,4,4 in -15,14; contains blocks -240,0,224 to -225,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 557704 game time, 29275 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: 130 total; [bdv['Tripl3j547'/162, l='MpServer', x=-563.68, y=12.62, z=300.51], ru['Creeper'/820, l='MpServer', x=-556.50, y=11.00, z=256.00], qi['Chicken'/273, l='MpServer', x=-589.50, y=73.00, z=244.50], sf['Skeleton'/279, l='MpServer', x=-590.88, y=40.00, z=372.41], sj['Zombie'/278, l='MpServer', x=-584.50, y=28.00, z=356.50], sf['Skeleton'/819, l='MpServer', x=-520.50, y=34.00, z=289.50], sj['Zombie'/277, l='MpServer', x=-582.50, y=28.00, z=356.50], sf['Skeleton'/818, l='MpServer', x=-519.50, y=34.00, z=290.50], ru['Creeper'/276, l='MpServer', x=-591.50, y=32.00, z=361.16], qm['Ocelot'/281, l='MpServer', x=-579.31, y=70.00, z=378.69], ru['Creeper'/280, l='MpServer', x=-591.69, y=40.00, z=372.72], qi['Chicken'/258, l='MpServer', x=-600.84, y=62.43, z=348.56], qi['Chicken'/259, l='MpServer', x=-605.50, y=64.00, z=344.50], rh['item.item.rottenFlesh'/256, l='MpServer', x=-607.31, y=66.13, z=286.41], qi['Chicken'/257, l='MpServer', x=-595.59, y=74.00, z=306.25], ru['Creeper'/262, l='MpServer', x=-595.50, y=39.00, z=377.50], qi['Chicken'/260, l='MpServer', x=-606.50, y=64.00, z=344.50], qi['Chicken'/261, l='MpServer', x=-605.50, y=64.00, z=345.50], nf['entity.ItemFrame.name'/305, l='MpServer', x=-570.50, y=65.50, z=312.94], ql['Mooshroom'/304, l='MpServer', x=-575.09, y=55.00, z=304.34], qi['Chicken'/307, l='MpServer', x=-570.50, y=67.00, z=323.50], nf['entity.ItemFrame.name'/306, l='MpServer', x=-571.50, y=65.50, z=312.94], sf['Skeleton'/313, l='MpServer', x=-559.50, y=28.00, z=227.50], rv['Enderman'/772, l='MpServer', x=-638.97, y=24.00, z=380.41], sj['Zombie'/292, l='MpServer', x=-570.63, y=25.00, z=259.88], qn['Pig'/294, l='MpServer', x=-566.47, y=55.00, z=304.38], qn['Pig'/295, l='MpServer', x=-568.91, y=55.00, z=306.50], ql['Mooshroom'/296, l='MpServer', x=-574.19, y=55.00, z=306.16], qn['Pig'/297, l='MpServer', x=-567.63, y=55.00, z=305.44], ql['Mooshroom'/298, l='MpServer', x=-573.09, y=55.00, z=306.53], ql['Mooshroom'/299, l='MpServer', x=-573.09, y=55.00, z=305.38], qi['Chicken'/300, l='MpServer', x=-570.53, y=55.00, z=300.63], ql['Mooshroom'/301, l='MpServer', x=-575.44, y=55.00, z=305.63], qn['Pig'/302, l='MpServer', x=-567.63, y=55.00, z=304.16], ql['Mooshroom'/303, l='MpServer', x=-573.66, y=55.00, z=304.16], sh['Spider'/343, l='MpServer', x=-516.28, y=40.00, z=243.72], qi['Chicken'/342, l='MpServer', x=-527.44, y=107.00, z=229.59], qn['Pig'/341, l='MpServer', x=-513.88, y=104.00, z=227.22], qi['Chicken'/340, l='MpServer', x=-527.66, y=102.00, z=232.84], ru['Creeper'/614, l='MpServer', x=-535.50, y=59.00, z=328.50], qg['Bat'/884, l='MpServer', x=-495.28, y=32.85, z=311.95], ru['Creeper'/615, l='MpServer', x=-536.50, y=59.00, z=326.50], qg['Bat'/886, l='MpServer', x=-491.72, y=30.90, z=310.70], ru['Creeper'/613, l='MpServer', x=-535.56, y=58.00, z=324.63], qg['Bat'/889, l='MpServer', x=-574.28, y=49.00, z=377.11], qg['Bat'/1025, l='MpServer', x=-586.25, y=30.82, z=359.75], sf['Skeleton'/350, l='MpServer', x=-516.25, y=34.00, z=335.31], ru['Creeper'/616, l='MpServer', x=-535.06, y=58.00, z=323.69], qj['Cow'/349, l='MpServer', x=-523.50, y=76.00, z=310.38], qg['Bat'/1027, l='MpServer', x=-580.16, y=31.00, z=362.09], qi['Chicken'/348, l='MpServer', x=-523.50, y=71.00, z=299.50], sj['Zombie'/622, l='MpServer', x=-503.50, y=39.00, z=265.50], qi['Chicken'/347, l='MpServer', x=-521.50, y=73.00, z=302.50], qi['Chicken'/346, l='MpServer', x=-522.50, y=72.00, z=300.50], sj['Zombie'/620, l='MpServer', x=-502.50, y=39.00, z=266.50], sj['Zombie'/621, l='MpServer', x=-500.50, y=39.00, z=267.50], qg['Bat'/344, l='MpServer', x=-515.13, y=40.31, z=245.09], sf['Skeleton'/631, l='MpServer', x=-571.03, y=23.00, z=254.50], sh['Spider'/630, l='MpServer', x=-572.91, y=23.00, z=254.50], qn['Pig'/334, l='MpServer', x=-531.31, y=66.00, z=377.50], qn['Pig'/335, l='MpServer', x=-533.50, y=68.00, z=375.31], sf['Skeleton'/632, l='MpServer', x=-569.50, y=23.00, z=248.50], rh['item.item.dyePowder.black'/333, l='MpServer', x=-539.88, y=60.13, z=353.28], sf['Skeleton'/331, l='MpServer', x=-532.91, y=61.00, z=315.50], sj['Zombie'/878, l='MpServer', x=-633.50, y=22.00, z=380.50], sj['Zombie'/373, l='MpServer', x=-499.50, y=38.00, z=376.50], sj['Zombie'/372, l='MpServer', x=-502.50, y=38.00, z=378.50], sj['Zombie'/374, l='MpServer', x=-501.50, y=38.00, z=376.50], sf['Skeleton'/368, l='MpServer', x=-504.50, y=30.00, z=375.50], qg['Bat'/380, l='MpServer', x=-493.81, y=49.70, z=369.97], qo['Sheep'/382, l='MpServer', x=-494.31, y=100.00, z=239.34], qj['Cow'/357, l='MpServer', x=-492.50, y=100.00, z=245.28], qj['Cow'/358, l='MpServer', x=-497.50, y=99.00, z=249.19], qo['Sheep'/359, l='MpServer', x=-501.50, y=99.00, z=247.50], sf['Skeleton'/364, l='MpServer', x=-506.31, y=33.00, z=333.50], ru['Creeper'/365, l='MpServer', x=-496.59, y=45.00, z=355.03], sg['Slime'/366, l='MpServer', x=-505.69, y=43.00, z=360.31], ru['Creeper'/367, l='MpServer', x=-495.75, y=45.00, z=353.94], qi['Chicken'/360, l='MpServer', x=-496.50, y=93.00, z=272.50], sf['Skeleton'/361, l='MpServer', x=-502.69, y=34.00, z=304.22], rj['entity.MinecartChest.name'/362, l='MpServer', x=-510.50, y=39.50, z=331.50], sj['Zombie'/363, l='MpServer', x=-507.06, y=33.00, z=334.56], bfk['Mattcat1998'/492, l='MpServer', x=-560.97, y=126.50, z=431.50], ru['Creeper'/387, l='MpServer', x=-491.47, y=45.00, z=356.44], sh['Spider'/384, l='MpServer', x=-492.50, y=29.00, z=344.50], sf['Skeleton'/929, l='MpServer', x=-574.50, y=42.00, z=256.50], rv['Enderman'/390, l='MpServer', x=-495.59, y=42.00, z=377.09], sj['Zombie'/389, l='MpServer', x=-494.50, y=42.00, z=379.50], qj['Cow'/171, l='MpServer', x=-573.09, y=55.00, z=299.69], qj['Cow'/170, l='MpServer', x=-575.53, y=55.00, z=298.47], qj['Cow'/169, l='MpServer', x=-573.09, y=55.00, z=298.47], qj['Cow'/168, l='MpServer', x=-573.09, y=55.00, z=301.91], qi['Chicken'/175, l='MpServer', x=-568.59, y=55.00, z=300.81], qn['Pig'/174, l='MpServer', x=-568.91, y=55.00, z=303.09], qi['Chicken'/173, l='MpServer', x=-569.22, y=55.00, z=302.22], qj['Cow'/172, l='MpServer', x=-574.31, y=55.00, z=300.84], qi['Chicken'/167, l='MpServer', x=-566.56, y=55.00, z=298.59], qi['Chicken'/166, l='MpServer', x=-568.72, y=55.00, z=302.22], qi['Chicken'/165, l='MpServer', x=-567.59, y=55.00, z=301.53], qi['Chicken'/164, l='MpServer', x=-568.41, y=55.00, z=298.59], sj['Zombie'/668, l='MpServer', x=-505.50, y=50.00, z=299.50], sj['Zombie'/669, l='MpServer', x=-506.31, y=50.00, z=295.78], sj['Zombie'/670, l='MpServer', x=-507.50, y=50.00, z=298.50], sf['Skeleton'/428, l='MpServer', x=-607.06, y=51.00, z=271.34], ru['Creeper'/667, l='MpServer', x=-503.50, y=53.00, z=285.50], qn['Pig'/178, l='MpServer', x=-566.47, y=55.00, z=303.09], ql['Mooshroom'/179, l='MpServer', x=-574.88, y=55.00, z=303.09], qi['Chicken'/176, l='MpServer', x=-569.22, y=55.00, z=300.31], qi['Chicken'/177, l='MpServer', x=-571.53, y=55.00, z=298.66], qg['Bat'/1016, l='MpServer', x=-529.29, y=43.93, z=374.43], qg['Bat'/1017, l='MpServer', x=-526.64, y=43.22, z=372.85], qg['Bat'/1019, l='MpServer', x=-535.76, y=44.64, z=378.50], qg['Bat'/1020, l='MpServer', x=-524.00, y=45.97, z=376.20], qg['Bat'/1023, l='MpServer', x=-582.31, y=30.33, z=362.15], qg['Bat'/1008, l='MpServer', x=-503.01, y=53.05, z=378.44], qn['Pig'/471, l='MpServer', x=-495.38, y=99.00, z=270.97], qg['Bat'/994, l='MpServer', x=-559.75, y=11.10, z=255.09], ru['Creeper'/753, l='MpServer', x=-491.53, y=62.00, z=280.00], qi['Chicken'/239, l='MpServer', x=-608.63, y=69.00, z=367.53], qi['Chicken'/238, l='MpServer', x=-617.47, y=67.00, z=354.44], qj['Cow'/237, l='MpServer', x=-620.47, y=64.00, z=254.63], sf['Skeleton'/231, l='MpServer', x=-613.50, y=45.00, z=226.50], ru['Creeper'/229, l='MpServer', x=-610.50, y=44.00, z=228.50], ru['Creeper'/228, l='MpServer', x=-611.50, y=44.00, z=230.50], qi['Chicken'/254, l='MpServer', x=-603.50, y=92.00, z=252.50], qi['Chicken'/255, l='MpServer', x=-601.50, y=102.00, z=251.50], qi['Chicken'/252, l='MpServer', x=-593.50, y=73.00, z=246.50], qi['Chicken'/253, l='MpServer', x=-602.50, y=76.00, z=254.50], sf['Skeleton'/973, l='MpServer', x=-607.01, y=46.00, z=376.47], qi['Chicken'/490, l='MpServer', x=-551.63, y=77.00, z=275.38]]
Retry entities: 0 total; []
Stacktrace:
at bds.a(SourceFile:282)
at net.minecraft.client.Minecraft.b(SourceFile:1881)
at net.minecraft.client.Minecraft.run(SourceFile:535)
at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
Minecraft Version: 1.5.2
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_10, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 3594833824 bytes (3428 MB) / 4116054016 bytes (3925 MB) up to 4116054016 bytes (3925 MB)
JVM Flags: 2 total; -Xms4096m -Xmx4096m
AABB Pool Size: 2443 (136808 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
Suspicious classes: IWrUpdater, Config, WrUpdaterSmooth, ...[reifnsk.minimap.ReiMinimap, WaypointEntity, MinimapException, ...]
IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
ModLoader: Mods loaded: 3
ModLoader 1.5.2
mod_ReiMinimap v3.3_05 [1.5.2]
mod_TooManyItems 1.5.2 2013-04-25

LWJGL: 2.4.2
OpenGL: GeForce GTX 660M/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
Is Modded: Very likely; Jar signature invalidated
Type: Client (map_client.txt)
Texture Pack: faithful32pack
Profiler Position: N/A (disabled)
Vec3 Pool Size: 416 (23296 bytes; 0 MB) allocated, 28 (1568 bytes; 0 MB) used