Report below. Just as summary says, game crashes every time I attempt to place any log.

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 6/19/14 12:04 AM
Description: Unexpected error

java.lang.IllegalArgumentException: Cannot set property ayi

as it does not exist!
at axy.a(SourceFile:128)
at atx.a(SourceFile:35)
at afg.a(SourceFile:61)
at aht.a(SourceFile:113)
at bxx.a(SourceFile:318)
at blh.ar(SourceFile:1320)
at blh.q(SourceFile:1677)
at blh.ap(SourceFile:860)
at blh.a(SourceFile:303)
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 axy.a(SourceFile:128)
at atx.a(SourceFile:35)
at afg.a(SourceFile:61)
at aht.a(SourceFile:113)
at bxx.a(SourceFile:318)
at blh.ar(SourceFile:1320)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [cbw['NeoZander'/181, l='MpServer', x=-180.74, y=66.00, z=198.63]]
Chunk stats: MultiplayerChunkCache: 622, 622
Level seed: 0
Level generator: ID 04 - customized, ver 0. Features enabled: false
Level generator options:
Level spawn location: -176.00,64.00,244.00 - World: (-176,64,244), Chunk: (at 0,4,4 in -11,15; contains blocks -176,0,240 to -161,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 705914 game time, 1043040 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: survival (ID 0). Hardcore: false. Cheats: false
Forced entities: 66 total; [aan['Creeper'/980314, l='MpServer', x=-166.50, y=16.00, z=142.50], aan['Creeper'/980313, l='MpServer', x=-160.41, y=17.00, z=136.34], acf['Zombie'/951470, l='MpServer', x=-105.50, y=55.00, z=212.50], abs['Skeleton'/970839, l='MpServer', x=-132.94, y=29.00, z=200.50], zc['Squid'/967976, l='MpServer', x=-134.72, y=59.09, z=247.34], zc['Squid'/967975, l='MpServer', x=-138.88, y=58.72, z=247.50], zc['Squid'/967973, l='MpServer', x=-132.75, y=57.81, z=240.03], zc['Squid'/967972, l='MpServer', x=-132.31, y=59.19, z=246.34], aap['Enderman'/982269, l='MpServer', x=-120.53, y=36.00, z=189.28], yn['Bat'/958212, l='MpServer', x=-235.69, y=29.10, z=158.31], aap['Enderman'/979713, l='MpServer', x=-222.50, y=25.00, z=268.50], yn['Bat'/981153, l='MpServer', x=-102.25, y=22.10, z=272.25], yn['Bat'/981152, l='MpServer', x=-102.25, y=20.95, z=272.68], yz['Sheep'/93529, l='MpServer', x=-171.06, y=72.00, z=221.60], yq['Cow'/68331, l='MpServer', x=-177.47, y=69.00, z=196.44], acf['Zombie'/965478, l='MpServer', x=-123.16, y=15.00, z=165.41], yn['Bat'/990558, l='MpServer', x=-197.49, y=11.16, z=131.36], acf['Zombie'/984548, l='MpServer', x=-156.41, y=35.00, z=250.91], yq['Cow'/85, l='MpServer', x=-177.47, y=69.00, z=199.78], yq['Cow'/84, l='MpServer', x=-180.41, y=69.00, z=202.47], aan['Creeper'/972937, l='MpServer', x=-211.00, y=20.00, z=155.56], yq['Cow'/87, l='MpServer', x=-177.50, y=69.00, z=200.88], yq['Cow'/86, l='MpServer', x=-179.28, y=69.00, z=202.41], aan['Creeper'/965489, l='MpServer', x=-125.78, y=15.00, z=165.28], acf['Zombie'/962334, l='MpServer', x=-245.50, y=14.00, z=137.50], yq['Cow'/83, l='MpServer', x=-178.75, y=69.02, z=196.44], yq['Cow'/82, l='MpServer', x=-177.47, y=69.00, z=197.56], yq['Cow'/88, l='MpServer', x=-177.56, y=69.00, z=198.56], abs['Skeleton'/970445, l='MpServer', x=-253.50, y=32.00, z=162.50], yz['Sheep'/110, l='MpServer', x=-171.04, y=72.00, z=223.92], ut['entity.ItemFrame.name'/111, l='MpServer', x=-175.03, y=74.50, z=261.50], yz['Sheep'/108, l='MpServer', x=-171.94, y=72.00, z=222.78], yz['Sheep'/109, l='MpServer', x=-169.94, y=72.02, z=224.00], yq['Cow'/119, l='MpServer', x=-142.91, y=82.00, z=158.09], yz['Sheep'/910380, l='MpServer', x=-172.16, y=72.00, z=219.84], ut['entity.ItemFrame.name'/113, l='MpServer', x=-175.03, y=73.50, z=261.50], ut['entity.ItemFrame.name'/112, l='MpServer', x=-175.03, y=75.50, z=261.50], yz['Sheep'/918982, l='MpServer', x=-170.00, y=72.00, z=219.84], aan['Creeper'/976103, l='MpServer', x=-142.50, y=35.00, z=260.50], zz['container.minecart'/139, l='MpServer', x=-121.50, y=41.06, z=227.47], aan['Creeper'/972448, l='MpServer', x=-217.50, y=19.00, z=133.50], acf['Zombie'/988970, l='MpServer', x=-128.50, y=37.00, z=153.50], acf['Zombie'/988968, l='MpServer', x=-127.50, y=37.00, z=150.50], abs['Skeleton'/976109, l='MpServer', x=-141.50, y=35.00, z=260.50], aan['Creeper'/965538, l='MpServer', x=-170.88, y=16.00, z=134.59], zz['container.minecart'/130, l='MpServer', x=-140.50, y=34.06, z=243.50], abs['Skeleton'/976107, l='MpServer', x=-146.59, y=35.00, z=264.16], aan['Creeper'/976104, l='MpServer', x=-143.44, y=35.00, z=262.94], zz['container.minecart'/151, l='MpServer', x=-108.50, y=15.06, z=143.50], zv['item.tile.netherFence'/886538, l='MpServer', x=-160.97, y=69.00, z=240.44], acf['Zombie'/982378, l='MpServer', x=-137.50, y=40.00, z=240.50], aan['Creeper'/982370, l='MpServer', x=-136.44, y=40.00, z=247.06], yq['Cow'/68356, l='MpServer', x=-177.56, y=69.00, z=202.06], yn['Bat'/946833, l='MpServer', x=-141.41, y=47.10, z=273.25], aca['Spider'/922202, l='MpServer', x=-153.44, y=14.00, z=228.84], cbw['NeoZander'/181, l='MpServer', x=-180.74, y=66.00, z=198.63], zc['Squid'/967648, l='MpServer', x=-124.38, y=48.88, z=245.72], aan['Creeper'/927592, l='MpServer', x=-216.03, y=18.00, z=123.63], acf['Zombie'/908053, l='MpServer', x=-166.50, y=15.00, z=168.50], aan['Creeper'/905869, l='MpServer', x=-235.72, y=12.78, z=132.50], abs['Skeleton'/978236, l='MpServer', x=-213.50, y=25.00, z=277.50], abs['Skeleton'/978239, l='MpServer', x=-213.50, y=25.00, z=276.50], acf['Zombie'/985492, l='MpServer', x=-178.50, y=16.00, z=166.50], aan['Creeper'/961681, l='MpServer', x=-105.50, y=32.00, z=182.50], zc['Squid'/967590, l='MpServer', x=-203.63, y=47.13, z=197.59], acf['Zombie'/955747, l='MpServer', x=-216.50, y=14.00, z=271.50]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bxy.a(SourceFile:310)
at blh.b(SourceFile:2133)
at blh.a(SourceFile:317)
at net.minecraft.client.main.Main.main(SourceFile:121)

– System Details –
Details:
Minecraft Version: 14w25a
Operating System: Windows 7 (amd64) version 6.1
Java Version: 1.7.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 217211472 bytes (207 MB) / 752287744 bytes (717 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 88
Launched Version: 14w25a
LWJGL: 2.9.1
OpenGL: GeForce 210/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
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.

Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: [ChromaHills-128x1.7_1.0.8.zip]
Current Language: English (US)
Profiler Position: N/A (disabled)