---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 5/13/16 4:23 PM
Description: Initializing game

java.lang.IllegalStateException: can't pop unfinished ProgressBar Rendering Setup
at net.minecraftforge.fml.common.ProgressManager.pop(ProgressManager.java:35)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:492)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:326)
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.minecraftforge.fml.common.ProgressManager.pop(ProgressManager.java:35)
at net.minecraft.client.Minecraft.func_71384_a(Minecraft.java:492)

-- Initialization --
Details:
Stacktrace:
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:326)
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 (x86) version 6.3
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
Memory: 101865056 bytes (97 MB) / 248442880 bytes (236 MB) up to 523501568 bytes (499 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
FML: MCP v9.10 FML v8.0.127.1103 2 mods loaded, 2 mods active
mcp{9.05} Minecraft Coder Pack Unloaded->Constructed->Pre-initialized
FML{8.0.127.1103} Forge Mod Loader Unloaded->Constructed->Pre-initialized
Loaded coremods (and transformers):
GL info: ' Vendor: 'ATI Technologies Inc.' Version: '4.5.13399 Compatibility Profile Context 15.201.1101.0' Renderer: 'AMD Radeon(TM) R5 Graphics'
Launched Version: 1.8-FML8.0.127.1103
LWJGL: 2.9.1
OpenGL: AMD Radeon(TM) R5 Graphics GL version 4.5.13399 Compatibility Profile Context 15.201.1101.0, ATI Technologies Inc.
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'
Type: Client (map_client.txt)
Resource Packs: []
Current Language: English (US)
Profiler Position: N/A (disabled)

Stacy's Wolves is for 1.7.10 only. You are running 1.8.