(Try solving the redstone bug first though...)
---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 4/30/14 9:15 PM
Description: Rendering entity in world

java.lang.NullPointerException: Rendering entity in world
	at cce.a(SourceFile:79)
	at cce.a(SourceFile:53)
	at cce.a(SourceFile:24)
	at cbt.a(SourceFile:219)
	at cbt.a(SourceFile:199)
	at cbt.a(SourceFile:176)
	at bxs.a(SourceFile:495)
	at bxl.a(SourceFile:1146)
	at bxl.b(SourceFile:937)
	at bjf.ai(SourceFile:828)
	at bjf.f(SourceFile:755)
	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 cce.a(SourceFile:79)
	at cce.a(SourceFile:53)
	at cce.a(SourceFile:24)

-- Entity being rendered --
Details:
	Entity Type: ItemFrame (uh)
	Entity ID: 33
	Entity Name: entity.ItemFrame.name
	Entity's Exact location: 673.50, 17.50, -552.97
	Entity's Block location: 673.00,17.00,-553.00 - World: (673,17,-553), Chunk: (at 1,1,7 in 42,-35; contains blocks 672,0,-560 to 687,255,-545), Region: (1,-2; contains chunks 32,-64 to 63,-33, blocks 512,0,-1024 to 1023,255,-513)
	Entity's Momentum: 0.00, 0.00, 0.00
	Entity's Rider: ~~ERROR~~ NullPointerException: null
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null

-- Renderer details --
Details:
	Assigned renderer: cce@24e28347
	Location: -10.38,0.49,16.59 - World: (-11,0,16), Chunk: (at 5,0,0 in -1,1; contains blocks -16,0,16 to -1,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Rotation: 0.0
	Delta: 0.7339136
Stacktrace:
	at cbt.a(SourceFile:219)
	at cbt.a(SourceFile:199)
	at cbt.a(SourceFile:176)
	at bxs.a(SourceFile:495)
	at bxl.a(SourceFile:1146)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bxb['USAProsecutor'/34, l='MpServer', x=683.88, y=17.01, z=-569.56]]
	Chunk stats: MultiplayerChunkCache: 81, 81
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: 644.00,4.00,-521.00 - World: (644,4,-521), Chunk: (at 4,0,7 in 40,-33; contains blocks 640,0,-528 to 655,255,-513), Region: (1,-2; contains chunks 32,-64 to 63,-33, blocks 512,0,-1024 to 1023,255,-513)
	Level time: 405592 game time, 88184 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 12 total; [yj['Pig'/17, l='MpServer', x=630.16, y=16.00, z=-546.19], ya['Chicken'/16, l='MpServer', x=633.72, y=16.00, z=-548.56], bxb['USAProsecutor'/34, l='MpServer', x=683.88, y=17.01, z=-569.56], yj['Pig'/19, l='MpServer', x=625.97, y=16.00, z=-559.97], ya['Chicken'/18, l='MpServer', x=634.81, y=16.00, z=-552.28], uh['entity.ItemFrame.name'/33, l='MpServer', x=673.50, y=17.50, z=-552.97], ya['Chicken'/21, l='MpServer', x=635.56, y=16.00, z=-534.66], zg['item.item.egg'/20, l='MpServer', x=634.22, y=16.00, z=-552.63], zg['item.item.egg'/23, l='MpServer', x=635.88, y=16.00, z=-533.91], yc['Horse'/22, l='MpServer', x=629.00, y=16.00, z=-536.69], zk['container.minecart'/29, l='MpServer', x=655.50, y=16.00, z=-555.53], yk['Sheep'/30, l='MpServer', x=653.97, y=16.00, z=-508.03]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at buw.a(SourceFile:308)
	at bjf.b(SourceFile:2069)
	at bjf.f(SourceFile:764)
	at net.minecraft.client.main.Main.main(SourceFile:121)

-- System Details --
Details:
	Minecraft Version: 14w18a
	Operating System: Mac OS X (x86_64) version 10.6.8
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 83351888 bytes (79 MB) / 186892288 bytes (178 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 14w18a
	LWJGL: 2.9.1
	OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 APPLE-1.6.42, 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: [SimpleCraft_V13.8]
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Anisotropic Filtering: Off (1)