---- Minecraft Crash Report ----
// I feel sad now :(

Time: 5/23/13 5:30 PM
Description: Exception in server tick loop

java.lang.NoClassDefFoundError: com/google/gson/GsonBuilder
	at cp.<clinit>(SourceFile:12)
	at gz.a(SourceFile:81)
	at bie.b(SourceFile:73)
	at net.minecraft.server.MinecraftServer.s(SourceFile:491)
	at net.minecraft.server.MinecraftServer.r(SourceFile:408)
	at bib.r(SourceFile:125)
	at net.minecraft.server.MinecraftServer.run(SourceFile:342)
	at gu.run(SourceFile:585)
Caused by: java.lang.ClassNotFoundException: com.google.gson.GsonBuilder
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:423)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
	... 8 more


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

-- System Details --
Details:
	Minecraft Version: 13w21a
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_05, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 95121352 bytes (90 MB) / 248139776 bytes (236 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 4 (224 bytes; 0 MB) allocated, 4 (224 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	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: Probably not. Jar signature remains and both client + server brands are untouched.