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I had pixelmon installed and started to get an error. Here's a copy of the crash report

---- Minecraft Crash Report ----

WARNING: coremods are present:
Contact their authors BEFORE contacting forge

// Who set us up the TNT?

Time: 11/25/15 3:51 PM
Description: Unexpected error

java.lang.IllegalStateException: Already building!
at net.minecraft.client.renderer.WorldRenderer.func_178964_a(WorldRenderer.java:194)
at net.minecraft.client.renderer.WorldRenderer.func_178970_b(WorldRenderer.java:187)
at net.minecraft.client.shader.Framebuffer.func_178038_a(Framebuffer.java:265)
at net.minecraft.client.shader.Framebuffer.func_147615_c(Framebuffer.java:230)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1082)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:345)
at net.minecraft.client.main.Main.main(SourceFile:120)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

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

-- Head --
Stacktrace:
at net.minecraft.client.renderer.WorldRenderer.func_178964_a(WorldRenderer.java:194)
at net.minecraft.client.renderer.WorldRenderer.func_178970_b(WorldRenderer.java:187)
at net.minecraft.client.shader.Framebuffer.func_178038_a(Framebuffer.java:265)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['AquaBacc'/52, l='MpServer', x=-102.53, y=68.81, z=-169.48]]
Chunk stats: MultiplayerChunkCache: 169, 169
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: -108.00,64.00,-168.00 - World: (-108,64,-168), Chunk: (at 4,4,8 in -7,-11; contains blocks -112,0,-176 to -97,255,-161), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Level time: 1865 game time, 1865 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: creative (ID 1). Hardcore: false. Cheats: false
Forced entities: 68 total; [EntityPixelmon['entity.pixelmon.Pixelmon.name'/384, l='MpServer', x=-22.97, y=62.53, z=-81.06], EntityPixelmon['entity.pixelmon.Pixelmon.name'/257, l='MpServer', x=-119.50, y=49.02, z=-187.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/263, l='MpServer', x=-103.50, y=41.02, z=-186.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/394, l='MpServer', x=-36.50, y=9.01, z=-101.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/139, l='MpServer', x=-122.19, y=62.97, z=-210.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/398, l='MpServer', x=-74.50, y=33.02, z=-185.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/147, l='MpServer', x=-35.41, y=63.97, z=-91.63], EntityPixelmon['entity.pixelmon.Pixelmon.name'/409, l='MpServer', x=-98.50, y=12.02, z=-251.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/283, l='MpServer', x=-123.50, y=64.02, z=-201.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/284, l='MpServer', x=-124.28, y=63.97, z=-210.50], EntityTrainer['entity.pixelmon.Trainer.name'/29, l='MpServer', x=-95.84, y=62.36, z=-127.56], EntityPixelmon['entity.pixelmon.Pixelmon.name'/285, l='MpServer', x=-127.50, y=62.21, z=-193.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/415, l='MpServer', x=-39.50, y=15.02, z=-156.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/160, l='MpServer', x=-117.50, y=63.02, z=-201.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/288, l='MpServer', x=-37.50, y=65.02, z=-91.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/161, l='MpServer', x=-115.17, y=63.03, z=-200.55], EntityPixelmon['entity.pixelmon.Pixelmon.name'/162, l='MpServer', x=-117.50, y=63.02, z=-203.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/163, l='MpServer', x=-117.50, y=63.02, z=-198.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/164, l='MpServer', x=-118.50, y=63.02, z=-207.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/293, l='MpServer', x=-133.50, y=67.02, z=-184.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/166, l='MpServer', x=-24.50, y=37.02, z=-207.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/170, l='MpServer', x=-134.50, y=64.02, z=-180.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/175, l='MpServer', x=-153.50, y=31.02, z=-177.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/176, l='MpServer', x=-154.50, y=31.02, z=-176.50], EntityPlayerSP['AquaBacc'/52, l='MpServer', x=-102.53, y=68.81, z=-169.48], EntityPixelmon['entity.pixelmon.Pixelmon.name'/54, l='MpServer', x=-102.16, y=68.00, z=-169.09], EntityPixelmon['entity.pixelmon.Pixelmon.name'/438, l='MpServer', x=-99.50, y=10.02, z=-94.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/59, l='MpServer', x=-155.40, y=53.43, z=-170.36], EntityPixelmon['entity.pixelmon.Pixelmon.name'/60, l='MpServer', x=-160.13, y=53.72, z=-177.52], EntityPixelmon['entity.pixelmon.Pixelmon.name'/61, l='MpServer', x=-156.94, y=53.69, z=-180.33], EntityPixelmon['entity.pixelmon.Pixelmon.name'/62, l='MpServer', x=-148.95, y=53.47, z=-170.02], EntityPixelmon['entity.pixelmon.Pixelmon.name'/67, l='MpServer', x=-152.70, y=50.50, z=-175.80], EntityPixelmon['entity.pixelmon.Pixelmon.name'/195, l='MpServer', x=-87.50, y=20.02, z=-171.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/196, l='MpServer', x=-133.50, y=66.02, z=-189.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/72, l='MpServer', x=-185.60, y=42.74, z=-159.16], EntityPixelmon['entity.pixelmon.Pixelmon.name'/73, l='MpServer', x=-184.72, y=43.05, z=-156.57], EntityPixelmon['entity.pixelmon.Pixelmon.name'/329, l='MpServer', x=-29.50, y=62.66, z=-91.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/74, l='MpServer', x=-183.95, y=42.28, z=-155.21], EntityPixelmon['entity.pixelmon.Pixelmon.name'/330, l='MpServer', x=-26.50, y=62.55, z=-87.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/75, l='MpServer', x=-189.64, y=42.43, z=-148.51], EntityPixelmon['entity.pixelmon.Pixelmon.name'/76, l='MpServer', x=-84.63, y=49.31, z=-73.90], EntityPixelmon['entity.pixelmon.Pixelmon.name'/332, l='MpServer', x=-26.50, y=62.10, z=-88.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/78, l='MpServer', x=-87.78, y=49.09, z=-74.62], EntityPixelmon['entity.pixelmon.Pixelmon.name'/80, l='MpServer', x=-83.22, y=49.58, z=-68.49], EntityTrainer['entity.pixelmon.Trainer.name'/337, l='MpServer', x=-36.72, y=63.02, z=-90.31], EntityPixelmon['entity.pixelmon.Pixelmon.name'/85, l='MpServer', x=-118.81, y=63.72, z=-198.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/86, l='MpServer', x=-118.97, y=62.97, z=-193.78], EntityPixelmon['entity.pixelmon.Pixelmon.name'/91, l='MpServer', x=-129.50, y=65.02, z=-179.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/348, l='MpServer', x=-131.50, y=62.27, z=-193.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/349, l='MpServer', x=-133.50, y=62.24, z=-193.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/352, l='MpServer', x=-132.50, y=20.02, z=-135.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/97, l='MpServer', x=-36.50, y=42.02, z=-87.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/226, l='MpServer', x=-129.50, y=67.02, z=-191.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/100, l='MpServer', x=-36.74, y=53.47, z=-267.19], EntityPixelmon['entity.pixelmon.Pixelmon.name'/228, l='MpServer', x=-93.67, y=13.93, z=-111.29], EntityPixelmon['entity.pixelmon.Pixelmon.name'/356, l='MpServer', x=-127.50, y=66.02, z=-186.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/101, l='MpServer', x=-28.67, y=53.41, z=-270.27], EntityPixelmon['entity.pixelmon.Pixelmon.name'/102, l='MpServer', x=-47.50, y=17.02, z=-173.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/230, l='MpServer', x=-125.24, y=64.00, z=-185.65], EntityPixelmon['entity.pixelmon.Pixelmon.name'/231, l='MpServer', x=-125.50, y=63.97, z=-189.28], EntityPixelmon['entity.pixelmon.Pixelmon.name'/363, l='MpServer', x=-96.50, y=63.02, z=-191.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/114, l='MpServer', x=-39.50, y=64.02, z=-93.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/372, l='MpServer', x=-63.50, y=22.02, z=-131.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/374, l='MpServer', x=-119.50, y=62.86, z=-190.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/376, l='MpServer', x=-25.00, y=63.01, z=-81.22], EntityPixelmon['entity.pixelmon.Pixelmon.name'/379, l='MpServer', x=-25.94, y=63.34, z=-83.97], EntityPixelmon['entity.pixelmon.Pixelmon.name'/382, l='MpServer', x=-25.50, y=62.91, z=-84.50], EntityPixelmon['entity.pixelmon.Pixelmon.name'/383, l='MpServer', x=-22.75, y=62.50, z=-83.75]]
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:407)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2502)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:374)
at net.minecraft.client.main.Main.main(SourceFile:120)
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:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_31, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 1979768576 bytes (1888 MB) / 3006529536 bytes (2867 MB) up to 3006529536 bytes (2867 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn2G
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.3.1543 Optifine OptiFine_1.8_HD_U_D5 4 mods loaded, 4 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAAAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAAAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.3.1543.jar)
UCHIJAAAA Forge{11.14.3.1543} [Minecraft Forge] (forge-1.8-11.14.3.1543.jar)
UCHIJAAAA pixelmon{4.0.7} [Pixelmon] (Pixelmon-1.8-4.0.7-universal.jar)
Loaded coremods (and transformers):
GL info: ' Vendor: 'Intel' Version: '4.2.0 - Build 10.18.10.3383' Renderer: 'Intel(R) HD Graphics 4400'
Launched Version: 1.8-Forge11.14.3.1543
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4400 GL version 4.2.0 - Build 10.18.10.3383, Intel
GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

Using VBOs: No
Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: [Pixelmon Johto Resources.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)