Minecraft crashes on startup

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 3/7/14 11:48 AM
Description: Parsing block model definition

com.google.gson.JsonSyntaxException: Missing variants, expected to find a JsonObject
	at qy.s(SourceFile:370)
	at buo.a(SourceFile:110)
	at buo.deserialize(SourceFile:104)
	at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58)
	at com.google.gson.Gson.fromJson(Gson.java:803)
	at com.google.gson.Gson.fromJson(Gson.java:868)
	at com.google.gson.Gson.fromJson(Gson.java:841)
	at bum.a(SourceFile:44)
	at ccn.a(SourceFile:37)
	at cbj.a(SourceFile:99)
	at beo.ae(SourceFile:457)
	at beo.f(SourceFile:739)
	at net.minecraft.client.main.Main.main(SourceFile:121)


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

-- Head --
Stacktrace:
	at qy.s(SourceFile:370)
	at buo.a(SourceFile:110)
	at buo.deserialize(SourceFile:104)
	at com.google.gson.TreeTypeAdapter.read(TreeTypeAdapter.java:58)
	at com.google.gson.Gson.fromJson(Gson.java:803)
	at com.google.gson.Gson.fromJson(Gson.java:868)
	at com.google.gson.Gson.fromJson(Gson.java:841)

-- Block model definition being parsed --
Details:
	Base location: minecraft:cactus
	Location: minecraft:models/block/cactus.json
Stacktrace:
	at bum.a(SourceFile:44)
	at ccn.a(SourceFile:37)
	at cbj.a(SourceFile:99)
	at beo.ae(SourceFile:457)

-- Initialization --
Details:
Stacktrace:
	at beo.f(SourceFile:739)
	at net.minecraft.client.main.Main.main(SourceFile:121)

-- System Details --
Details:
	Minecraft Version: 14w10b
	Operating System: Mac OS X (x86_64) version 10.9.1
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 33697744 bytes (32 MB) / 85000192 bytes (81 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 14w10b
	LWJGL: 2.9.1
	OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 INTEL-8.18.28, Intel Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [test]
	Current Language: Deutsch (Deutschland)
	Profiler Position: N/A (disabled)
	Anisotropic Filtering: Off (1)