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So I created a new skin, then I downloaded it. I went onto a singleplayer world to test it, but I was steve. So i exited minecraft and opened it back up again, clicked on the same world, but then I crashed. But for some reason when I opened it back up again and chose a multiplayer server, it worked. Here's the crash report:

---- Minecraft Crash Report ----

WARNING: coremods are present:
CCLCorePlugin (CodeChickenLib-1.8-1.1.2.133-universal.jar)
CodeChickenCorePlugin (CodeChickenCore-1.8-1.0.5.36-universal.jar)
CCCDeobfPlugin (unknown)
NEICorePlugin (NotEnoughItems-1.8-1.0.5.104-universal.jar)
Contact their authors BEFORE contacting forge

// Why is it breaking

Time: 1/17/16 6:17 PM
Description: Exception in server tick loop

java.lang.IllegalArgumentException: ChunkNibbleArrays should be 2048 bytes not: 0
at net.minecraft.world.chunk.NibbleArray.<init>(SourceFile:16)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75823_a(AnvilChunkLoader.java:440)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.checkedReadChunkFromNBT__Async(AnvilChunkLoader.java:143)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.loadChunk__Async(AnvilChunkLoader.java:120)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:20)
at net.minecraftforge.common.chunkio.ChunkIOProvider.callStage1(ChunkIOProvider.java:12)
at net.minecraftforge.common.util.AsynchronousExecutor.skipQueue(AsynchronousExecutor.java:343)
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:117)
at net.minecraft.world.gen.ChunkProviderServer.func_73158_c(ChunkProviderServer.java:92)
at net.minecraft.server.MinecraftServer.func_71222_d(MinecraftServer.java:302)
at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:180)
at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:203)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:438)
at java.lang.Thread.run(Thread.java:745)

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

-- System Details --
Details:
Minecraft Version: 1.8
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 401923408 bytes (383 MB) / 709857280 bytes (676 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
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
FML: MCP v9.10 FML v8.0.99.99 Minecraft Forge 11.14.4.1563 Optifine OptiFine_1.8_HD_U_G9 10 mods loaded, 10 mods active
States: 'U' = Unloaded 'L' = Loaded 'C' = Constructed 'H' = Pre-initialized 'I' = Initialized 'J' = Post-initialized 'A' = Available 'D' = Disabled 'E' = Errored
UCHIJAA mcp{9.05} [Minecraft Coder Pack] (minecraft.jar)
UCHIJAA FML{8.0.99.99} [Forge Mod Loader] (forge-1.8-11.14.4.1563.jar)
UCHIJAA Forge{11.14.4.1563} [Minecraft Forge] (forge-1.8-11.14.4.1563.jar)
UCHIJAA CodeChickenCore{1.0.5.36} [CodeChicken Core] (minecraft.jar)
UCHIJAA NotEnoughItems{1.0.5.104} [Not Enough Items] (NotEnoughItems-1.8-1.0.5.104-universal.jar)
UCHIJAA DamageIndicatorsMod{3.3.3} [Damage Indicators] ([1.8]DamageIndicatorsMod-3.3.3.jar.zip)
UCHIJAA CustomSpawner{3.4.0} [DrZhark's CustomSpawner] (CustomMobSpawner 3.4.0.jar)
UCHIJAA MoCreatures{8.0.1} [DrZhark's Mo'Creatures Mod] (DrZhark's Mo'Creatures Mod-8.0.1.jar)
UCHIJAA lucky{6.0.1} [Lucky Block] (LuckyBlock_1-8_v6-0-1.zip)
UCHIJAA TooMuchTNT{3.0} [TooMuchTNT] (TooMuchTNT v3.0 (1).jar)
Loaded coremods (and transformers):
CCLCorePlugin (CodeChickenLib-1.8-1.1.2.133-universal.jar)
codechicken.lib.asm.ClassHeirachyManager
codechicken.lib.asm.RenderHookTransformer
CodeChickenCorePlugin (CodeChickenCore-1.8-1.0.5.36-universal.jar)
codechicken.core.asm.InterfaceDependancyTransformer
codechicken.core.asm.TweakTransformer
codechicken.core.asm.DelegatedTransformer
codechicken.core.asm.DefaultImplementationTransformer
CCCDeobfPlugin (unknown)

NEICorePlugin (NotEnoughItems-1.8-1.0.5.104-universal.jar)
codechicken.nei.asm.NEITransformer
GL info: ~~ERROR~~ RuntimeException: No OpenGL context found in the current thread.
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Type: Integrated Server (map_client.txt)
Is Modded: Definitely; Client brand changed to 'fml,forge'

So it's just the save? And is it or is it not connected to my skin? And how do you use spoilers? Thanks.

Alrighty, thanks guys.