Crash Report

---- Minecraft Crash Report ----
// I just don't know what went wrong :(

Time: 6/4/15 5:32 PM
Description: Starting integrated server

java.lang.NoClassDefFoundError: net/minecraft/command/server/CommandTickspeed
	at cl.<init>(ServerCommandManager.java:54)
	at cyo.<init>(SourceFile:8)
	at cyk.h(SourceFile:62)
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:169)
	at cyk.<init>(SourceFile:46)
	at bsu.a(Minecraft.java:1712)
	at bwf.a(SourceFile:210)
	at bxf.a(SourceFile:342)
	at bwf.a(SourceFile:350)
	at bxf.k(SourceFile:405)
	at bxf.p(SourceFile:382)
	at bsu.r(Minecraft.java:1342)
	at bsu.as(Minecraft.java:858)
	at bsu.a(Minecraft.java:330)
	at net.minecraft.client.main.Main.main(SourceFile:120)
Caused by: java.lang.ClassNotFoundException: net.minecraft.command.server.CommandTickspeed
	at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 15 more


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

-- Head --
Stacktrace:
	at cl.<init>(ServerCommandManager.java:54)
	at cyo.<init>(SourceFile:8)
	at cyk.h(SourceFile:62)
	at net.minecraft.server.MinecraftServer.<init>(SourceFile:169)
	at cyk.<init>(SourceFile:46)

-- Starting integrated server --
Details:
	Level ID: Tickspeed
	Level Name: Tickspeed
Stacktrace:
	at bsu.a(Minecraft.java:1712)
	at bwf.a(SourceFile:210)
	at bxf.a(SourceFile:342)
	at bwf.a(SourceFile:350)
	at bxf.k(SourceFile:405)
	at bxf.p(SourceFile:382)

-- Affected screen --
Details:
	Screen name: bxq
Stacktrace:
	at bsu.r(Minecraft.java:1342)
	at bsu.as(Minecraft.java:858)
	at bsu.a(Minecraft.java:330)
	at net.minecraft.client.main.Main.main(SourceFile:120)

-- System Details --
Details:
	Minecraft Version: 1.8
	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: 171688304 bytes (163 MB) / 253153280 bytes (241 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: 0, tallocated: 0
	Launched Version: Tickspeed
	LWJGL: 2.9.1
	OpenGL: Intel(R) HD Graphics 4400 GL version 4.3.0 - Build 10.18.10.3960, Intel
	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: Very likely; Jar signature invalidated
	Type: Client (map_client.txt)
	Resource Packs: [faithful32pack.zip, 1.8-Models-master]
	Current Language: English (US)
	Profiler Position: N/A (disabled)