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Does anyone know what's wrong with my minecraft? I play on a personal modpack my younger brother and I made, but after about 20-30 mins. of gameplay, this error pops up every time. I'v tried googling the issue, but I was unable to find any solutions. Thanks in advance!

---- Minecraft Crash Report ----
// Don't do that.

Time: 5/14/15 10:40 PM
Description: Unexpected error

java.lang.ArrayIndexOutOfBoundsException: 7
at micdoodle8.mods.galacticraft.core.blocks.BlockSlabGC.func_149691_a(BlockSlabGC.java:86)
at net.minecraft.block.Block.func_149673_e(Block.java:556)
at net.minecraft.client.renderer.RenderBlocks.func_147793_a(RenderBlocks.java:8227)
at net.minecraft.client.renderer.RenderBlocks.func_147808_b(RenderBlocks.java:5235)
at net.minecraft.client.renderer.RenderBlocks.func_147784_q(RenderBlocks.java:4247)
at net.minecraft.client.renderer.RenderBlocks.func_147805_b(RenderBlocks.java:255)
at net.minecraft.client.renderer.WorldRenderer.func_147892_a(WorldRenderer.java:181)
at net.minecraft.client.renderer.RenderGlobal.func_72716_a(RenderGlobal.java:1553)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1187)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1011)
at weather2.weathersystem.EntityRendererProxyWeather2Mini.func_78480_b(EntityRendererProxyWeather2Mini.java:50)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:989)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:887)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:134)
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 micdoodle8.mods.galacticraft.core.blocks.BlockSlabGC.func_149691_a(BlockSlabGC.java:86)
at net.minecraft.block.Block.func_149673_e(Block.java:556)
at net.minecraft.client.renderer.RenderBlocks.func_147793_a(RenderBlocks.java:8227)
at net.minecraft.client.renderer.RenderBlocks.func_147808_b(RenderBlocks.java:5235)
at net.minecraft.client.renderer.RenderBlocks.func_147784_q(RenderBlocks.java:4247)
at net.minecraft.client.renderer.RenderBlocks.func_147805_b(RenderBlocks.java:255)
at net.minecraft.client.renderer.WorldRenderer.func_147892_a(WorldRenderer.java:181)
at net.minecraft.client.renderer.RenderGlobal.func_72716_a(RenderGlobal.java:1553)
at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1187)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1011)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=311.70, y=67.50, z=287.76]]
Chunk stats: MultiplayerChunkCache: 591, 591
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options:
Level spawn location: World: (230,80,344), Chunk: (at 6,5,8 in 14,21; contains blocks 224,0,336 to 239,255,351), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 404587 game time, 28749 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: 85 total; [EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2821, l='MpServer', x=335.50, y=62.10, z=327.00], EntityEliteCarbine['an Elite wielding a Carbine'/2832, l='MpServer', x=346.94, y=45.00, z=332.50], MoCEntityWerewolf['Werewolf'/164371, l='MpServer', x=202.13, y=33.00, z=316.97], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2836, l='MpServer', x=352.00, y=32.00, z=366.50], EntityPig['Pig'/2845, l='MpServer', x=355.19, y=63.00, z=240.44], EntityPig['Pig'/2846, l='MpServer', x=367.84, y=63.00, z=335.97], EntityPig['Pig'/2847, l='MpServer', x=367.06, y=67.00, z=340.19], GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=215.31, y=67.62, z=285.02], EntityPig['Pig'/2849, l='MpServer', x=365.03, y=75.00, z=363.16], EntityCreeper['Creeper'/174886, l='MpServer', x=242.56, y=13.00, z=328.00], EntityCreeper['Creeper'/174887, l='MpServer', x=245.50, y=13.00, z=321.50], EntitySkeleton['Skeleton'/174891, l='MpServer', x=285.50, y=36.00, z=244.50], EntityPig['Pig'/2857, l='MpServer', x=380.91, y=72.00, z=265.28], EntityPig['Pig'/2858, l='MpServer', x=374.22, y=70.00, z=269.25], EntityPig['Pig'/2860, l='MpServer', x=379.81, y=71.00, z=349.50], EntityPig['Pig'/2861, l='MpServer', x=378.50, y=76.00, z=354.50], EntityCreeper['Creeper'/174892, l='MpServer', x=284.41, y=36.00, z=248.03], EntityCow['Cow'/2862, l='MpServer', x=371.44, y=70.00, z=352.47], EntitySkeleton['Skeleton'/176950, l='MpServer', x=334.50, y=18.00, z=250.50], EntitySkeleton['Skeleton'/176951, l='MpServer', x=336.50, y=18.00, z=252.50], EntitySkeleton['Skeleton'/176948, l='MpServer', x=334.50, y=18.00, z=249.50], EntitySkeleton['Skeleton'/176949, l='MpServer', x=336.50, y=18.00, z=250.50], EntityWaypointContainer['unknown'/3410, l='MpServer', x=0.00, y=0.00, z=0.00], EntityZombie['Zombie'/174678, l='MpServer', x=258.63, y=13.00, z=325.63], EntityCreeper['Creeper'/174677, l='MpServer', x=265.25, y=13.00, z=329.50], EntityZombie['Zombie'/174680, l='MpServer', x=264.31, y=13.00, z=328.97], EntityZombie['Zombie'/174681, l='MpServer', x=262.91, y=13.00, z=325.38], GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=206.88, y=86.44, z=332.98], EntityCreeper['Creeper'/171122, l='MpServer', x=329.50, y=34.00, z=293.50], EntityCreeper['Creeper'/171123, l='MpServer', x=324.50, y=34.00, z=296.50], MoCEntitySilverSkeleton['SilverSkeleton'/174710, l='MpServer', x=271.50, y=58.00, z=234.50], EntityPig['Pig'/118644, l='MpServer', x=380.06, y=71.00, z=245.13], EntityCreeper['Creeper'/171124, l='MpServer', x=320.50, y=34.00, z=300.50], EntityZombie['Zombie'/171125, l='MpServer', x=328.50, y=34.00, z=294.50], EntityXPOrb['Rupee'/66949, l='MpServer', x=205.94, y=76.25, z=336.50], EntityCreeper['Creeper'/174725, l='MpServer', x=293.50, y=33.00, z=240.50], MoCEntityFirefly['Firefly'/2711, l='MpServer', x=184.19, y=71.00, z=253.53], EntitySkeleton['Skeleton'/174746, l='MpServer', x=342.50, y=50.00, z=359.50], MoCEntityDuck['Duck'/2723, l='MpServer', x=190.66, y=63.00, z=286.47], GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=299.87, y=69.62, z=350.45], MoCEntityMouse['Mouse'/2724, l='MpServer', x=204.25, y=63.00, z=349.59], GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=311.70, y=67.50, z=287.76], EntityBulletBlue['burning Blue Plasma'/177572, l='MpServer', x=308.00, y=68.37, z=275.91], GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=267.55, y=71.62, z=271.46], GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=207.90, y=72.62, z=345.78], MoCEntityMouse['Mouse'/2733, l='MpServer', x=235.44, y=72.00, z=224.25], MoCEntityMouse['Mouse'/2741, l='MpServer', x=245.34, y=72.00, z=214.47], EntityGruntPlasmaPistol['a Grunt wielding a Plasma Pistol'/136375, l='MpServer', x=316.50, y=70.00, z=347.50], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2744, l='MpServer', x=281.86, y=71.00, z=298.52], MoCEntityMaggot['Maggot'/2747, l='MpServer', x=242.59, y=67.00, z=266.38], MoCEntityMouse['Mouse'/2749, l='MpServer', x=238.72, y=68.00, z=290.59], EntityPig['Pig'/2750, l='MpServer', x=259.69, y=76.00, z=303.50], EntityBulletBlue['burning Blue Plasma'/177597, l='MpServer', x=310.11, y=67.67, z=280.95], EntityTrail['unknown'/136384, l='MpServer', x=311.70, y=67.62, z=287.76], EntityEliteCarbine['an Elite wielding a Carbine'/2755, l='MpServer', x=265.47, y=66.00, z=263.22], MoCEntityMaggot['Maggot'/2756, l='MpServer', x=263.60, y=69.00, z=274.59], EntityEliteCarbine['an Elite wielding a Carbine'/2766, l='MpServer', x=277.88, y=66.00, z=259.09], MoCEntitySnail['Snail'/2768, l='MpServer', x=277.84, y=66.00, z=260.47], MoCEntityMaggot['Maggot'/2769, l='MpServer', x=271.63, y=66.00, z=267.19], EntitySpider['Spider'/173527, l='MpServer', x=263.50, y=20.00, z=335.09], MoCEntityAnt['Ant'/2775, l='MpServer', x=294.72, y=69.00, z=352.81], MoCEntityCricket['Cricket'/2776, l='MpServer', x=256.59, y=77.00, z=376.13], MoCEntitySnail['Snail'/2778, l='MpServer', x=291.44, y=66.00, z=266.19], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2779, l='MpServer', x=301.50, y=66.00, z=267.50], EntitySkeleton['Skeleton'/173529, l='MpServer', x=263.50, y=20.00, z=336.66], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2780, l='MpServer', x=301.75, y=66.00, z=257.41], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2781, l='MpServer', x=289.94, y=66.00, z=265.50], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2782, l='MpServer', x=302.59, y=66.00, z=257.59], EntityBulletBlue['burning Blue Plasma'/177640, l='MpServer', x=305.77, y=67.47, z=264.26], MoCEntityButterfly['ButterFly'/2800, l='MpServer', x=302.81, y=70.00, z=355.41], EntityPig['Pig'/163826, l='MpServer', x=383.63, y=72.00, z=249.81], MoCEntityCricket['Cricket'/2801, l='MpServer', x=292.19, y=70.00, z=358.59], MoCEntityButterfly['ButterFly'/2802, l='MpServer', x=299.56, y=97.00, z=395.81], MoCEntityFly['Fly'/2805, l='MpServer', x=316.28, y=68.00, z=239.44], MoCEntityFly['Fly'/2806, l='MpServer', x=313.53, y=69.00, z=234.78], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2807, l='MpServer', x=305.43, y=66.00, z=262.05], EntityElitePlasmaRifle['an Elite wielding a Plasma Rifle'/2808, l='MpServer', x=308.61, y=66.00, z=270.49], MoCEntitySnail['Snail'/2809, l='MpServer', x=319.25, y=62.00, z=277.41], EntityCreeper['Creeper'/176891, l='MpServer', x=304.50, y=32.00, z=223.50], GCEntityClientPlayerMP['McSlash1234'/2971, l='MpServer', x=306.91, y=71.62, z=351.06], MoCEntitySnail['Snail'/2810, l='MpServer', x=306.56, y=66.00, z=270.72], MoCEntityAnt['Ant'/2811, l='MpServer', x=331.88, y=71.00, z=343.69], EntityEliteCarbine['an Elite wielding a Carbine'/2812, l='MpServer', x=295.03, y=70.00, z=358.75], MoCEntityBee['Bee'/2813, l='MpServer', x=308.25, y=97.00, z=390.28], MoCEntityFly['Fly'/2815, l='MpServer', x=321.78, y=68.00, z=245.56]]
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:373)
at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2432)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:916)
at net.minecraft.client.main.Main.main(SourceFile:148)
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:134)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)

-- System Details --
Details:
Minecraft Version: 1.7.10
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: 121092520 bytes (115 MB) / 889933824 bytes (848 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
AABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
FML: MCP v9.05 FML v7.10.85.1291 Minecraft Forge 10.13.2.1291 30 mods loaded, 30 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{7.10.85.1291} [Forge Mod Loader] (forge-1.7.10-10.13.2.1291.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{10.13.2.1291} [Minecraft Forge] (forge-1.7.10-10.13.2.1291.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CodeChickenCore{1.0.4.29} [CodeChicken 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
NotEnoughItems{1.0.3.74} [Not Enough Items] (NotEnoughItems-1.7.10-1.0.3.74-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
lucky{5.1.0} [Lucky Block] ([1-7-10]_Lucky_Block_v5-1-0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
DamageIndicatorsMod{3.2.3} [Damage Indicators] ([1.7.10]DamageIndicatorsMod-3.2.3.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
bspkrsCore{6.16} [bspkrsCore] ([1.7.10]bspkrsCore-universal-6.16.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Treecapitator{1.7.10} [Treecapitator] ([1.7.10]Treecapitator-universal-2.0.4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiblioCraft{1.10.4} [BiblioCraft] (BiblioCraft[v1.10.4][MC1.7.10].jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BiomesOPlenty{2.1.0} [Biomes O' Plenty] (BiomesOPlenty-1.7.10-2.1.0.1057-universal.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ComputerCraft{1.73} [ComputerCraft] (ComputerCraft1.73.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
BuildMod{v1.0} [Build Mod] (CoroUtil-1.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CoroAI{v1.0} [CoroAI] (CoroUtil-1.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtendedRenderer{v1.0} [Extended Renderer] (CoroUtil-1.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ConfigMod{v1.0} [Extended Mod Config] (CoroUtil-1.1.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
CustomSpawner{3.3.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.3.0.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
dimdoors{2.2.5-test} [Dimensional Doors] (DimensionalDoors-2.2.5-test8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
MoCreatures{6.3.1} [DrZhark's Mo'Creatures Mod] (DrZharks MoCreatures Mod v6.3.1.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
ExtraUtilities{1.2.4c} [Extra Utilities] (extrautilities-1.2.4c.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
freddycraftmod{1.2} [FreddyCraft] (FreddyCraft-1.7.10-1.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GalacticraftCore{3.0.8} [Galacticraft Core] (GalacticraftCore-1.7-3.0.8.257.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
GalacticraftMars{3.0.8} [Galacticraft Planets] (Galacticraft-Planets-1.7-3.0.8.257.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
godzillamod{1.6.6} [Godzilla Mod] (Godzilla Mod-1.7.10-1.6.6.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
halocraft{0.7.1} [Halocraft v0.7.1] (Halocraft v0.7.1 (MC 1.7.10).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
killerchief_halocraft{0.7.0} [HalocraftOldIDUpdater] (Halocraft v0.7.1 (MC 1.7.10).zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Morph{0.9.1} [Morph] (Morph-Beta-0.9.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
weather2{v2.3.6} [weather2] (Weather-2.3.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.7.10
LWJGL: 2.9.1
OpenGL: Intel(R) HD Graphics 4000 GL version 4.0.0 - Build 10.18.10.3958, Intel
GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

Is Modded: Definitely; Client brand changed to 'fml,forge'
Type: Client (map_client.txt)
Resource Packs: [Chandler's Resource Pack, Chandler's Skin Pack 1.7.10-]
Current Language: English (US)
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Anisotropic Filtering: Off (1)

Quote from grimallq»

First thing to try: Update Galacticraft. That is a very badly outdated version.

Sadly, This did not help :\

In my crash report it said :"---- Minecraft Crash Report ----// Oops.Time: 24/10/15 12:03 PMDescription: Getting block java.lang.ArrayIndexOutOfBoundsException: 1103"

And looking through my logs it said :" <MinecraftUsername> moved wrongly" like 6 times.

Then looking at my world file I saw 6 dim-files ( called :"dim-37" and similar ) but in the game I have only been to the overworld (dim1) and the nether (dim-1) so i deleted all the other dim-files and then it worked again.

This is not a call for help, but rather a solution for others with a similar problem, that dont want to start over.