So while loading up forge for mc 1.8 I start playing in a world (testing my mod) and this happens to me a lot:

 

 

[16:12:19] [Client thread/FATAL]: Unreported exception thrown!
java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_20]
at java.util.HashMap$KeyIterator.next(Unknown Source) ~[?:1.8.0_20]
at com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection$WrappedIterator.next(AbstractMapBasedMultimap.java:486) ~[guava-17.0.jar:?]
at net.minecraft.util.ClassInheritanceMultiMap$2.computeNext(ClassInheritanceMultiMap.java:125) ~[forgeSrc-1.8-11.14.0.1268-1.8.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143) ~[guava-17.0.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138) ~[guava-17.0.jar:?]
at net.minecraft.client.renderer.RenderGlobal.renderEntities(RenderGlobal.java:615) ~[RenderGlobal.class:?]
at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1294) ~[EntityRenderer.class:?]
at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1207) ~[EntityRenderer.class:?]
at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1032) ~[EntityRenderer.class:?]
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1048) ~[Minecraft.class:?]
at net.minecraft.client.Minecraft.run(Minecraft.java:345) [Minecraft.class:?]
at net.minecraft.client.main.Main.main(Main.java:117) [Main.class:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_20]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_20]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_20]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_20]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]
at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:78) [start/:?]
at GradleStart.main(GradleStart.java:45) [start/:?]
[16:12:19] [Client thread/INFO] [sTDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:568]: ---- Minecraft Crash Report ----
// But it works on my machine.

Time: 13/12/14 4:12 PM
Description: Unexpected error

java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextNode(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection$WrappedIterator.next(AbstractMapBasedMultimap.java:486)
at net.minecraft.util.ClassInheritanceMultiMap$2.computeNext(ClassInheritanceMultiMap.java:125)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at net.minecraft.client.renderer.RenderGlobal.renderEntities(RenderGlobal.java:615)
at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1294)
at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1207)
at net.minecraft.client.renderer.EntityRenderer.updateCameraAndRender(EntityRenderer.java:1032)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1048)
at net.minecraft.client.Minecraft.run(Minecraft.java:345)
at net.minecraft.client.main.Main.main(Main.java:117)
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)
at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:78)
at GradleStart.main(GradleStart.java:45)


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

-- Head --
Stacktrace:
at java.util.HashMap$HashIterator.nextNode(Unknown Source)
at java.util.HashMap$KeyIterator.next(Unknown Source)
at com.google.common.collect.AbstractMapBasedMultimap$WrappedCollection$WrappedIterator.next(AbstractMapBasedMultimap.java:486)
at net.minecraft.util.ClassInheritanceMultiMap$2.computeNext(ClassInheritanceMultiMap.java:125)
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:143)
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:138)
at net.minecraft.client.renderer.RenderGlobal.renderEntities(RenderGlobal.java:615)
at net.minecraft.client.renderer.EntityRenderer.renderWorldPass(EntityRenderer.java:1294)
at net.minecraft.client.renderer.EntityRenderer.renderWorld(EntityRenderer.java:1207)

-- Affected level --
Details:
Level name: MpServer
All players: 1 total; [EntityPlayerSP['The_SlayerMC'/406, l='MpServer', x=252.80, y=62.70, z=124.29]]
Chunk stats: MultiplayerChunkCache: 838, 838
Level seed: 0
Level generator: ID 00 - default, ver 1. Features enabled: false
Level generator options: 
Level spawn location: 236.00,64.00,252.00 - World: (236,64,252), Chunk: (at 12,4,12 in 14,15; contains blocks 224,0,240 to 239,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 10387 game time, 10387 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: 143 total; [EntityZombie['Zombie'/37633, l='MpServer', x=245.50, y=56.00, z=121.50], EntityZombie['Zombie'/37634, l='MpServer', x=245.50, y=56.00, z=118.50], EntitySkeleton['Skeleton'/38406, l='MpServer', x=244.79, y=10.32, z=139.69], EntitySkeleton['Skeleton'/38408, l='MpServer', x=254.50, y=16.00, z=143.50], EntityFish['entity.essence.fish.name'/40457, l='MpServer', x=256.28, y=61.98, z=125.24], EntitySkeleton['Skeleton'/38410, l='MpServer', x=256.50, y=16.00, z=144.50], EntityTurtle['entity.essence.essenceTurtle.name'/36113, l='MpServer', x=216.63, y=64.18, z=144.63], EntityTurtle['entity.essence.essenceTurtle.name'/36115, l='MpServer', x=226.50, y=66.00, z=149.50], EntityPlayerSP['The_SlayerMC'/406, l='MpServer', x=252.80, y=62.70, z=124.29], EntitySpider['Spider'/37658, l='MpServer', x=268.50, y=11.00, z=129.50], EntitySpider['Spider'/37659, l='MpServer', x=266.50, y=11.00, z=129.50], EntityChicken['Chicken'/35099, l='MpServer', x=224.56, y=66.00, z=78.59], EntitySpyclops['entity.essence.spyclops.name'/38173, l='MpServer', x=233.50, y=67.00, z=204.50], EntityItem['item.tile.doublePlant.rose'/10015, l='MpServer', x=211.34, y=67.00, z=177.91], EntityCreeper['Creeper'/37663, l='MpServer', x=226.97, y=13.00, z=92.50], EntityTurtle['entity.essence.essenceTurtle.name'/37666, l='MpServer', x=238.50, y=63.00, z=69.50], EntitySheep['Sheep'/35109, l='MpServer', x=262.94, y=66.00, z=64.03], EntitySheep['Sheep'/35110, l='MpServer', x=273.53, y=63.00, z=70.53], EntityChicken['Chicken'/35116, l='MpServer', x=272.50, y=65.00, z=60.50], EntityChicken['Chicken'/35117, l='MpServer', x=272.50, y=64.00, z=63.50], EntityCreeper['Creeper'/36403, l='MpServer', x=260.50, y=31.00, z=167.50], EntityCreeper['Creeper'/36404, l='MpServer', x=260.50, y=31.00, z=166.50], EntityBat['Bat'/37684, l='MpServer', x=239.48, y=38.63, z=125.21], EntityCreeper['Creeper'/36405, l='MpServer', x=262.50, y=31.00, z=166.50], EntityFish['entity.essence.fish.name'/40502, l='MpServer', x=255.23, y=62.33, z=125.58], EntitySkeleton['Skeleton'/38199, l='MpServer', x=212.50, y=17.00, z=183.50], EntitySkeleton['Skeleton'/38200, l='MpServer', x=210.50, y=17.00, z=183.50], EntitySkeleton['Skeleton'/38201, l='MpServer', x=212.50, y=17.00, z=178.50], EntitySkeleton['Skeleton'/36410, l='MpServer', x=235.47, y=17.00, z=156.09], EntitySkeleton['Skeleton'/38202, l='MpServer', x=212.50, y=17.00, z=181.50], EntitySkeleton['Skeleton'/36411, l='MpServer', x=232.47, y=19.00, z=144.88], EntitySkeleton['Skeleton'/36412, l='MpServer', x=230.28, y=17.00, z=148.09], EntityBat['Bat'/36925, l='MpServer', x=238.45, y=23.97, z=157.20], EntityCreeper['Creeper'/36414, l='MpServer', x=226.50, y=17.00, z=150.50], EntityItem['item.item.fish.cod.raw'/7745, l='MpServer', x=253.31, y=63.00, z=138.78], EntityItem['item.item.fish.cod.raw'/7746, l='MpServer', x=255.69, y=62.00, z=142.72], EntityFish['entity.essence.fish.name'/40271, l='MpServer', x=256.69, y=61.01, z=125.71], EntityBat['Bat'/37201, l='MpServer', x=239.15, y=30.22, z=122.20], EntityBat['Bat'/35676, l='MpServer', x=231.48, y=19.08, z=146.32], EntityFish['entity.essence.fish.name'/40544, l='MpServer', x=255.42, y=61.01, z=125.58], EntityCow['Cow'/35172, l='MpServer', x=209.59, y=64.00, z=74.25], EntityBat['Bat'/37737, l='MpServer', x=239.25, y=14.33, z=175.84], EntityItem['item.item.fish.cod.raw'/38505, l='MpServer', x=236.66, y=21.00, z=147.84], EntitySkeleton['Skeleton'/37228, l='MpServer', x=250.34, y=15.00, z=144.31], EntityFish['entity.essence.fish.name'/39026, l='MpServer', x=342.50, y=69.00, z=162.50], EntityFish['entity.essence.fish.name'/40307, l='MpServer', x=257.05, y=61.01, z=123.11], EntityFish['entity.essence.fish.name'/39028, l='MpServer', x=267.50, y=44.00, z=137.50], EntityItem['item.item.fish.cod.raw'/38517, l='MpServer', x=246.13, y=19.00, z=158.00], EntitySheep['Sheep'/118, l='MpServer', x=194.84, y=67.00, z=134.47], EntitySkeleton['Skeleton'/37494, l='MpServer', x=243.38, y=29.00, z=123.16], EntityItem['item.item.fish.cod.raw'/38518, l='MpServer', x=244.97, y=19.00, z=155.88], EntityItem['item.item.fish.cod.raw'/35190, l='MpServer', x=196.63, y=15.00, z=75.88], EntitySkeleton['Skeleton'/37495, l='MpServer', x=242.47, y=33.00, z=125.13], EntityChicken['Chicken'/35191, l='MpServer', x=202.50, y=64.00, z=70.69], EntitySheep['Sheep'/120, l='MpServer', x=193.56, y=67.00, z=134.47], EntitySkeleton['Skeleton'/37496, l='MpServer', x=239.50, y=30.00, z=106.50], EntityChicken['Chicken'/35192, l='MpServer', x=201.66, y=64.00, z=75.63], EntitySheep['Sheep'/121, l='MpServer', x=191.63, y=64.00, z=128.84], EntityFish['entity.essence.fish.name'/40573, l='MpServer', x=254.50, y=61.00, z=125.50], EntitySheep['Sheep'/127, l='MpServer', x=192.50, y=67.00, z=204.50], EntitySheep['Sheep'/128, l='MpServer', x=188.00, y=66.00, z=200.06], EntitySheep['Sheep'/129, l='MpServer', x=193.50, y=64.00, z=201.50], EntityFish['entity.essence.fish.name'/39042, l='MpServer', x=329.50, y=64.00, z=96.50], EntityBat['Bat'/37763, l='MpServer', x=289.86, y=28.34, z=85.43], EntityFish['entity.essence.fish.name'/39043, l='MpServer', x=329.50, y=64.00, z=95.50], EntityBat['Bat'/37764, l='MpServer', x=290.39, y=29.90, z=90.41], EntityFish['entity.essence.fish.name'/39044, l='MpServer', x=327.50, y=64.00, z=94.50], EntityFish['entity.essence.fish.name'/39046, l='MpServer', x=328.50, y=64.00, z=96.50], EntityFish['entity.essence.fish.name'/39050, l='MpServer', x=240.50, y=27.00, z=179.88], EntityFish['entity.essence.fish.name'/39051, l='MpServer', x=240.50, y=27.00, z=180.56], EntityFish['entity.essence.fish.name'/40344, l='MpServer', x=256.47, y=61.02, z=124.00], EntityBat['Bat'/35489, l='MpServer', x=235.22, y=33.03, z=204.28], EntityZombie['Zombie'/37793, l='MpServer', x=239.50, y=18.00, z=121.50], EntityBat['Bat'/35491, l='MpServer', x=231.16, y=34.72, z=204.85], EntityCow['Cow'/35237, l='MpServer', x=209.50, y=65.00, z=84.50], EntitySpider['Spider'/38565, l='MpServer', x=246.50, y=27.00, z=163.50], EntityCow['Cow'/35238, l='MpServer', x=211.50, y=64.00, z=84.69], EntityChicken['Chicken'/35239, l='MpServer', x=205.63, y=64.00, z=72.69], EntityCow['Cow'/35240, l='MpServer', x=210.66, y=64.00, z=81.91], EntityPig['Pig'/170, l='MpServer', x=226.53, y=62.36, z=188.47], EntityPig['Pig'/171, l='MpServer', x=227.31, y=64.00, z=185.75], EntityPig['Pig'/172, l='MpServer', x=221.53, y=68.00, z=182.81], EntityCreeper['Creeper'/35500, l='MpServer', x=266.50, y=18.00, z=172.50], EntityPig['Pig'/173, l='MpServer', x=225.34, y=63.00, z=187.44], EntitySheep['Sheep'/174, l='MpServer', x=218.25, y=64.00, z=188.84], EntitySheep['Sheep'/175, l='MpServer', x=210.19, y=64.00, z=191.41], EntityChicken['Chicken'/35247, l='MpServer', x=269.50, y=65.00, z=59.50], EntitySheep['Sheep'/176, l='MpServer', x=214.72, y=64.00, z=186.22], EntityChicken['Chicken'/35248, l='MpServer', x=270.50, y=65.00, z=60.50], EntitySheep['Sheep'/177, l='MpServer', x=224.16, y=62.19, z=188.72], EntityBunny['entity.essence.bunny.name'/37297, l='MpServer', x=269.50, y=18.00, z=128.50], EntityCreeper['Creeper'/37810, l='MpServer', x=264.50, y=14.00, z=109.50], EntityCreeper['Creeper'/35765, l='MpServer', x=263.50, y=17.00, z=172.50], EntityCreeper['Creeper'/35766, l='MpServer', x=263.69, y=18.06, z=171.00], EntityCreeper['Creeper'/35767, l='MpServer', x=270.50, y=17.00, z=170.50], EntitySkeleton['Skeleton'/36279, l='MpServer', x=218.50, y=25.00, z=140.50], EntitySheep['Sheep'/184, l='MpServer', x=254.84, y=63.00, z=157.84], EntityItem['item.tile.mushroom'/187, l='MpServer', x=244.13, y=13.00, z=170.88], EntitySkeleton['Skeleton'/37309, l='MpServer', x=266.13, y=31.00, z=173.25], EntityFish['entity.essence.fish.name'/40387, l='MpServer', x=256.01, y=61.25, z=124.91], EntityCow['Cow'/35012, l='MpServer', x=233.53, y=62.58, z=122.84], EntityCow['Cow'/35013, l='MpServer', x=233.30, y=64.00, z=116.10], EntityCow['Cow'/35014, l='MpServer', x=224.42, y=64.69, z=119.40], EntityCow['Cow'/35015, l='MpServer', x=224.72, y=65.00, z=130.53], EntityCow['Cow'/35016, l='MpServer', x=215.97, y=65.00, z=119.13], EntityCow['Cow'/35017, l='MpServer', x=217.94, y=65.00, z=121.63], EntityCow['Cow'/35018, l='MpServer', x=197.53, y=66.00, z=121.44], EntityCow['Cow'/35019, l='MpServer', x=195.94, y=64.00, z=127.88], EntityCow['Cow'/35020, l='MpServer', x=193.44, y=64.00, z=122.06], EntitySheep['Sheep'/35021, l='MpServer', x=189.56, y=67.00, z=117.31], EntityCow['Cow'/35022, l='MpServer', x=189.25, y=66.00, z=118.50], EntitySheep['Sheep'/35023, l='MpServer', x=281.77, y=64.00, z=124.53], EntityItem['item.tile.doublePlant.syringa'/39631, l='MpServer', x=303.88, y=64.00, z=118.78], EntitySheep['Sheep'/208, l='MpServer', x=283.50, y=66.00, z=131.50], EntitySheep['Sheep'/35024, l='MpServer', x=283.50, y=65.00, z=127.50], EntitySheep['Sheep'/209, l='MpServer', x=283.16, y=64.00, z=183.34], EntitySheep['Sheep'/35025, l='MpServer', x=289.50, y=65.00, z=124.50], EntitySheep['Sheep'/210, l='MpServer', x=291.50, y=64.00, z=179.50], EntityItem['item.tile.doublePlant.syringa'/35026, l='MpServer', x=300.41, y=64.00, z=121.78], EntitySheep['Sheep'/211, l='MpServer', x=292.44, y=63.00, z=182.84], EntitySheep['Sheep'/212, l='MpServer', x=295.50, y=64.00, z=178.50], EntityCow['Cow'/213, l='MpServer', x=310.50, y=69.00, z=174.50], EntityCow['Cow'/214, l='MpServer', x=309.50, y=71.00, z=170.50], EntityCow['Cow'/215, l='MpServer', x=308.50, y=69.00, z=173.50], EntityFish['entity.essence.fish.name'/40151, l='MpServer', x=255.28, y=61.00, z=124.28], EntityCow['Cow'/216, l='MpServer', x=309.50, y=68.00, z=176.50], EntitySmallHongo['entity.essence.smallHongo.name'/37342, l='MpServer', x=317.50, y=84.00, z=195.50], EntityTurtle['entity.essence.essenceTurtle.name'/39390, l='MpServer', x=233.50, y=66.00, z=159.50], EntitySmallHongo['entity.essence.smallHongo.name'/37343, l='MpServer', x=318.50, y=84.00, z=195.50], EntitySmallHongo['entity.essence.smallHongo.name'/37345, l='MpServer', x=319.50, y=84.00, z=194.50], EntitySkeleton['Skeleton'/38371, l='MpServer', x=228.53, y=14.00, z=160.88], EntityFish['entity.essence.fish.name'/40419, l='MpServer', x=256.50, y=61.02, z=126.50], EntitySheep['Sheep'/233, l='MpServer', x=329.50, y=75.00, z=165.50], EntitySheep['Sheep'/234, l='MpServer', x=330.50, y=72.00, z=166.50], EntitySheep['Sheep'/235, l='MpServer', x=328.50, y=71.00, z=165.50], EntitySheep['Sheep'/236, l='MpServer', x=329.50, y=75.00, z=165.50], EntityZombie['Zombie'/35566, l='MpServer', x=240.47, y=27.00, z=178.66], EntitySheep['Sheep'/35314, l='MpServer', x=269.44, y=64.00, z=65.50], EntitySheep['Sheep'/35315, l='MpServer', x=270.75, y=64.00, z=65.50], EntityItem['item.item.seeds'/7668, l='MpServer', x=222.06, y=64.00, z=147.00], EntityCreeper['Creeper'/37621, l='MpServer', x=264.50, y=14.00, z=97.50], EntityCow['Cow'/35322, l='MpServer', x=192.88, y=63.00, z=46.00], EntityBat['Bat'/36861, l='MpServer', x=228.66, y=20.09, z=156.47]]
Retry entities: 0 total; []
Server brand: fml,forge
Server type: Integrated singleplayer server
Stacktrace:
at net.minecraft.client.multiplayer.WorldClient.addWorldInfoToCrashReport(WorldClient.java:350)
at net.minecraft.client.Minecraft.addGraphicsAndWorldToCrashReport(Minecraft.java:2488)
at net.minecraft.client.Minecraft.run(Minecraft.java:374)
at net.minecraft.client.main.Main.main(Main.java:117)
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)
at net.minecraftforge.gradle.GradleStartCommon.launch(GradleStartCommon.java:78)
at GradleStart.main(GradleStart.java:45)

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.8.0_20, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 593214440 bytes (565 MB) / 1037959168 bytes (989 MB) up to 1037959168 bytes (989 MB)
JVM Flags: 3 total; -Xincgc -Xmx1024M -Xms1024M
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.10 FML v8.0.12.1268 Minecraft Forge 11.14.0.1268 4 mods loaded, 4 mods active
mcp{9.05} [Minecraft Coder Pack] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
FML{8.0.12.1268} [Forge Mod Loader] (forgeSrc-1.8-11.14.0.1268-1.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Forge{11.14.0.1268} [Minecraft Forge] (forgeSrc-1.8-11.14.0.1268-1.8.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
essence{1.7} [Essence of the Gods] (bin) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available->Available->Available
Launched Version: 1.8
LWJGL: 2.9.1
OpenGL: GeForce GT 230/PCI/SSE2 GL version 3.2.0, NVIDIA Corporation
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: []
Current Language: English (US)
Profiler Position: N/A (disabled)
[16:12:19] [Client thread/INFO] [sTDOUT]: [net.minecraft.init.Bootstrap:printToSYSOUT:568]: #@!@# Game crashed! Crash report saved to: #@!@# C:\Development\Forge 1.8\eclipse\.\crash-reports\crash-2014-12-13_16.12.19-client.txt
[16:12:19] [Client thread/INFO] [FML]: Waiting for the server to terminate/save.
[16:12:19] [Client thread/INFO] [FML]: Server terminated.
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release

 

 

 

So I'm basically just wondering if this crash is because of me or because of forge not being stable yet. I would look more into the crash but it refers to something i cant control (not my code, it's mc's code)

 

So I think the likely reason is..

Because Mojang.

 

But if it's not, can someone tell me what it?

This is a bug of minecraftforge, it happens to me a lot to.

https://github.com/MinecraftForge/MinecraftForge/issues/1562