The Crash report:
---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 05/03/16 16:25
Description: Unexpected error

java.lang.IllegalArgumentException: Cannot set property arp

to oak on block minecraft:log2, it is not an allowed value
at ard$a.a(SourceFile:177)
at ana.a(SourceFile:55)
at amp.a(SourceFile:51)
at acc.a(SourceFile:50)
at adq.a(SourceFile:134)
at bkt.a(SourceFile:351)
at bcf.ax(SourceFile:1448)
at bcf.aA(SourceFile:1953)
at bcf.az(SourceFile:1771)
at bcf.t(SourceFile:1615)
at bcf.av(SourceFile:962)
at bcf.a(SourceFile:392)
at net.minecraft.client.main.Main.main(SourceFile:124)

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

– Head –
Stacktrace:
at ard$a.a(SourceFile:177)
at ana.a(SourceFile:55)
at amp.a(SourceFile:51)
at acc.a(SourceFile:50)
at adq.a(SourceFile:134)
at bkt.a(SourceFile:351)
at bcf.ax(SourceFile:1448)
at bcf.aA(SourceFile:1953)
at bcf.az(SourceFile:1771)

– Affected level –
Details:
Level name: MpServer
All players: 1 total; [bmt['DanTDMsfan'/802, l='MpServer', x=-1672.21, y=64.00, z=-424.60]]
Chunk stats: MultiplayerChunkCache: 1045, 1045
Level seed: 0
Level generator: ID 04 - customized, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-1669,68,-413), Chunk: (at 11,4,3 in -105,-26; contains blocks -1680,0,-416 to -1665,255,-401), Region: (-4,-1; contains chunks -128,-32 to -97,-1, blocks -2048,0,-512 to -1537,255,-1)
Level time: 63060 game time, 82894 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: 64 total; [vu['Flying Fox'/642, l='MpServer', x=-1653.47, y=48.10, z=-428.96], vu['Flying Fox'/643, l='MpServer', x=-1654.25, y=48.10, z=-422.30], vu['Flying Fox'/644, l='MpServer', x=-1653.43, y=48.10, z=-428.45], vu['Flying Fox'/645, l='MpServer', x=-1653.75, y=48.10, z=-428.27], aai['container.minecart'/651, l='MpServer', x=-1635.50, y=34.06, z=-388.50], wa['Mad-cow'/533, l='MpServer', x=-1729.72, y=68.00, z=-400.38], wa['Mad-cow'/535, l='MpServer', x=-1728.70, y=68.00, z=-398.68], wa['Mad-cow'/663, l='MpServer', x=-1629.23, y=72.00, z=-466.86], vu['Flying Fox'/1687, l='MpServer', x=-1716.55, y=31.00, z=-385.75], wa['Mad-cow'/536, l='MpServer', x=-1734.48, y=68.00, z=-404.18], wa['Mad-cow'/664, l='MpServer', x=-1628.15, y=73.00, z=-452.50], wa['Mad-cow'/537, l='MpServer', x=-1729.06, y=67.00, z=-397.55], aai['container.minecart'/538, l='MpServer', x=-1743.50, y=33.06, z=-373.50], vu['Flying Fox'/1690, l='MpServer', x=-1715.33, y=33.00, z=-385.97], wa['Mad-cow'/543, l='MpServer', x=-1718.30, y=68.00, z=-430.73], wa['Mad-cow'/544, l='MpServer', x=-1717.55, y=64.38, z=-424.44], wa['Mad-cow'/545, l='MpServer', x=-1712.79, y=66.00, z=-427.53], wa['Mad-cow'/673, l='MpServer', x=-1608.54, y=72.00, z=-490.15], wa['Mad-cow'/546, l='MpServer', x=-1717.24, y=67.00, z=-430.87], wa['Mad-cow'/674, l='MpServer', x=-1612.48, y=71.00, z=-491.22], wa['Mad-cow'/547, l='MpServer', x=-1721.50, y=67.00, z=-427.85], wa['Mad-cow'/675, l='MpServer', x=-1608.07, y=75.00, z=-477.54], wa['Mad-cow'/548, l='MpServer', x=-1726.60, y=68.00, z=-401.55], wa['Mad-cow'/676, l='MpServer', x=-1607.12, y=75.00, z=-477.61], wa['Mad-cow'/549, l='MpServer', x=-1734.26, y=69.00, z=-408.18], wa['Mad-cow'/677, l='MpServer', x=-1606.18, y=76.00, z=-476.58], wa['Mad-cow'/550, l='MpServer', x=-1714.62, y=65.00, z=-413.21], wa['Mad-cow'/552, l='MpServer', x=-1726.44, y=68.00, z=-398.80], vu['Flying Fox'/1704, l='MpServer', x=-1679.97, y=19.45, z=-350.75], vu['Flying Fox'/1707, l='MpServer', x=-1728.75, y=16.40, z=-367.25], wa['Mad-cow'/686, l='MpServer', x=-1598.24, y=63.00, z=-353.17], wa['Mad-cow'/687, l='MpServer', x=-1592.80, y=64.00, z=-352.38], wa['Mad-cow'/689, l='MpServer', x=-1596.30, y=63.00, z=-348.59], wa['Mad-cow'/690, l='MpServer', x=-1595.09, y=63.00, z=-346.15], wa['Mad-cow'/692, l='MpServer', x=-1597.20, y=63.00, z=-348.53], wa['Mad-cow'/693, l='MpServer', x=-1599.50, y=63.00, z=-344.50], wa['Mad-cow'/568, l='MpServer', x=-1693.80, y=71.00, z=-484.48], vu['Flying Fox'/1721, l='MpServer', x=-1718.50, y=18.29, z=-447.72], wa['Mad-cow'/570, l='MpServer', x=-1705.41, y=65.00, z=-432.84], vu['Flying Fox'/1722, l='MpServer', x=-1717.81, y=18.23, z=-450.81], wa['Mad-cow'/571, l='MpServer', x=-1705.14, y=66.00, z=-437.13], wa['Mad-cow'/572, l='MpServer', x=-1707.49, y=65.00, z=-435.21], wa['Mad-cow'/573, l='MpServer', x=-1705.22, y=65.00, z=-405.50], vu['Flying Fox'/1615, l='MpServer', x=-1602.23, y=45.03, z=-491.68], wa['Mad-cow'/592, l='MpServer', x=-1686.36, y=70.00, z=-488.85], vu['Flying Fox'/1616, l='MpServer', x=-1602.48, y=45.06, z=-488.35], wa['Mad-cow'/593, l='MpServer', x=-1687.81, y=71.00, z=-466.63], wa['Mad-cow'/594, l='MpServer', x=-1684.44, y=71.00, z=-472.82], wa['Mad-cow'/595, l='MpServer', x=-1689.27, y=71.00, z=-473.86], wa['Mad-cow'/596, l='MpServer', x=-1686.18, y=70.00, z=-479.51], wa['Mad-cow'/597, l='MpServer', x=-1700.24, y=75.00, z=-403.85], wa['Mad-cow'/598, l='MpServer', x=-1694.57, y=75.00, z=-403.82], vu['Flying Fox'/599, l='MpServer', x=-1689.40, y=60.10, z=-394.42], aai['container.minecart'/600, l='MpServer', x=-1680.50, y=32.06, z=-373.50], aai['container.minecart'/601, l='MpServer', x=-1689.50, y=33.06, z=-366.50], bmt['DanTDMsfan'/802, l='MpServer', x=-1672.21, y=64.00, z=-424.60], wa['Mad-cow'/616, l='MpServer', x=-1675.77, y=73.00, z=-476.49], vu['Flying Fox'/617, l='MpServer', x=-1677.75, y=49.10, z=-436.57], wa['Mad-cow'/492, l='MpServer', x=-1751.65, y=64.00, z=-454.81], aai['container.minecart'/497, l='MpServer', x=-1746.50, y=29.06, z=-364.50], aai['container.minecart'/498, l='MpServer', x=-1744.50, y=29.06, z=-352.50], vu['Flying Fox'/1396, l='MpServer', x=-1610.47, y=42.11, z=-469.69], wa['Mad-cow'/638, l='MpServer', x=-1654.58, y=75.00, z=-478.84], wa['Mad-cow'/639, l='MpServer', x=-1658.69, y=66.00, z=-436.83]]
Retry entities: 0 total; []
Server brand: vanilla
Server type: Integrated singleplayer server
Stacktrace:
at bku.a(SourceFile:365)
at bcf.b(SourceFile:2515)
at bcf.a(SourceFile:406)
at net.minecraft.client.main.Main.main(SourceFile:124)

– System Details –
Details:
Minecraft Version: 1.9
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 190444320 bytes (181 MB) / 606703616 bytes (578 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: 12, tallocated: 94
Launched Version: 1.9
LWJGL: 2.9.4
OpenGL: Intel(R) HD Graphics GL version 4.0.0 - Build 10.18.10.4276, 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: Yes
Is Modded: Probably not. Jar signature remains and client brand is untouched.
Type: Client (map_client.txt)
Resource Packs: §lDefault 3D§r §l16w10a.zip
Current Language: Australian English (Australia)
Profiler Position: N/A (disabled)
CPU: 2x Intel(R) Celeron(R) CPU N2840 @ 2.16GHz