So I've had this problem before too, but i just made a new world and it happened again. As soon as i try opening my world Forge crashes and sends me back to the launcher.
Here is the crash report
---- Minecraft Crash Report ----
// My bad.
Time: 6/10/15 4:17 PM
Description: Exception in server tick loop
java.lang.ArrayIndexOutOfBoundsException: -4
at net.minecraft.world.chunk.NibbleArray.func_76582_a(SourceFile:26)
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_76665_b(SourceFile:75)
at net.minecraft.world.chunk.Chunk.func_76628_c(Chunk.java:548)
at net.minecraft.world.chunk.Chunk.func_150812_a(Chunk.java:878)
at net.minecraft.world.chunk.Chunk.func_150813_a(Chunk.java:862)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadEntities(AnvilChunkLoader.java:500)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:41)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)
at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)
at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:126)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:265)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:78)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
So I've had this problem before too, but i just made a new world and it happened again. As soon as i try opening my world Forge crashes and sends me back to the launcher.
Here is the crash report
---- Minecraft Crash Report ----
// My bad.
Time: 6/10/15 4:17 PM
Description: Exception in server tick loop
java.lang.ArrayIndexOutOfBoundsException: -4
at net.minecraft.world.chunk.NibbleArray.func_76582_a(SourceFile:26)
at net.minecraft.world.chunk.storage.ExtendedBlockStorage.func_76665_b(SourceFile:75)
at net.minecraft.world.chunk.Chunk.func_76628_c(Chunk.java:548)
at net.minecraft.world.chunk.Chunk.func_150812_a(Chunk.java:878)
at net.minecraft.world.chunk.Chunk.func_150813_a(Chunk.java:862)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadEntities(AnvilChunkLoader.java:500)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:41)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage2(ChunkIOProvider.java:12)
at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:344)
at net.minecraftforge.common.util.AsynchronousExecutor.getSkipQueue(AsynchronousExecutor.java:302)
at net.minecraftforge.common.chunkio.ChunkIOExecutor.syncChunkLoad(ChunkIOExecutor.java:12)
at net.minecraft.world.gen.ChunkProviderServer.loadChunk(ChunkProviderServer.java:126)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:101)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:265)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:78)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:92)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:387)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)
A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------
-- System Details --
Details:
Minecraft Version: 1.7.10
Operating System: Windows 8.1 (amd64) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 222082984 bytes (211 MB) / 429125632 bytes (409 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: 12, tallocated: 94
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
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
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
CodeChickenCore{1.0.4.29} [CodeChicken Core] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->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
VeinMiner_coremod{0.27.1_build.unknown} [Core mod] (minecraft.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
battlegear2{1.7.10} [Mine & Blade Battlegear 2 - Bullseye] (1.7.10-MB_Battlegear2-Bullseye-1.0.8.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
zeldaswordskills{1.7.10-2.2.5.c} [Zelda Sword Skills] (1.7.10-zeldaswordskills-2.2.5.c.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Backpack{2.0.1} [Backpack] (Backpacks-Mod.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
bigtrees{1.6.4} [BigTrees] (BigTrees-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
flansmod{4.4.0} [Flan's Mod] (Flans Mod-1.7.10-4.4.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
iChunUtil{4.2.2} [iChunUtil] (iChunUtil-4.2.2.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
GraviGun{4.0.0-beta} [GraviGun] (GravityGun-4.0.0-beta.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Hats{4.0.1} [Hats] (Hats-4.0.1.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
magicwand{1.0.0} [Magic Wand mod] (Kuuus-Magic-Wand-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
lucky{5.1.0} [Lucky Block] (Lucky-Block-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
MoarOres{V2.4.5} [MoarOres] (MoarOres-2.4.5.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
MoreMetalMod{1.0.2} [More Metal Mod] (More-Metal-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
mopickaxes{630} [Mo' Pickaxes] (More-Pickaxes-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Morph{0.9.1} [Morph] (Morphing-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
cfm{3.4.7} [ยง9MrCrayfish's Furniture Mod] (MrCrayfishFurnitureModv3.4.7(1.7.10).jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
mininghats{1.3} [Mining Hats] (Night-Vision-Mining-Hats-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
OreSpawn{1.7.10.20.3} [OreSpawn] (orespawn-1.7.10-20.3.zip) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
PortalGun{4.0.0-beta-4} [PortalGun] (PortalGun-4.0.0-beta-4.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
rouletteores{1.0.7} [RouletteOres] (RouletteOres-1.0.7.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Dirtbike{v1.2.0} [Dirtbike Mod] (The-Dirtbike-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Torched{4.0.0} [Torched] (Torched-4.0.0.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
VeinMiner{0.27.1_build.unknown} [Vein Miner] (VeinMiner-1.7.10_0.27.1.unknown.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
VeinMinerModSupport{0.27.1_build.unknown} [Mod Support] (VeinMiner-1.7.10_0.27.1.unknown.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
YALSM{2.1.3} [Yet Another Leather Smelting Mod] (Yet-Another-Leather-Smelting-Mod-1.7.10.jar) Unloaded->Constructed->Pre-initialized->Initialized->Post-initialized->Available->Available
Profiler Position: N/A (disabled)
Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'
Oh :/
I dont :T
Oh well thanks anyways