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I was making an Adventure map, and when I did a specific /blockdata command on a spawner, the game crashed. Whenever I open the world, it instantly crashes. The command was performed by a command block onto of a spawner. Could someone please tell me why this happened, and if there is ANY POSSIBLE WAY to salvage my map?

Here is the command:

/blockdata ~ ~-1 ~ {SpawnCount:3,SpawnRange:10,RequiredPlayerRange:30,MinSpawnDelay:1,MaxSpawnDelay:2,MaxNearbyEntities:35,SpawnPotentials:[{Type:Creeper,Properties:{ActiveEffects:[{Id:11,Duration:1000000,Amplifier:4,ShowParticles:false}],Weight:1}},{Type:Creeper,Properties:{ActiveEffects:[{Id:11,Duration:1000000,Amplifier:4,ShowParticles:false}],Powered:1,Weight:1}}]}

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

Time: 9/4/15 3:06 PM
Description: Ticking block entity

java.lang.IllegalArgumentException
at oa.a(SourceFile:17)
at oa.a(SourceFile:35)
at add.h(SourceFile:183)
at add.c(SourceFile:97)
at all.c(SourceFile:55)
at adm.i(SourceFile:1313)
at le.i(SourceFile:478)
at net.minecraft.server.MinecraftServer.B(SourceFile:607)
at net.minecraft.server.MinecraftServer.A(SourceFile:535)
at bpo.A(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:451)
at java.lang.Thread.run(Thread.java:695)

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

-- Head --
Stacktrace:
at oa.a(SourceFile:17)
at oa.a(SourceFile:35)
at add.h(SourceFile:183)
at add.c(SourceFile:97)
at all.c(SourceFile:55)

-- Block entity being ticked --
Details:
Name: MobSpawner // all
Block type: ID #52 (tile.mobSpawner // ahy)
Block data value: 0 / 0x0 / 0b0000
Block location: World: (-340,10,-2), Chunk: (at 12,0,14 in -22,-1; contains blocks -352,0,-16 to -337,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
Actual block type: ID #52 (tile.mobSpawner // ahy)
Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
at adm.i(SourceFile:1313)
at le.i(SourceFile:478)

-- Affected level --
Details:
Level name: Map
All players: 1 total; [lf['DarkPineapple58'/33, l='Map', x=-340.92, y=10.00, z=-2.42]]
Chunk stats: ServerChunkCache: 976 Drop: 0
Level seed: 1417444136305198003
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: -144.00,9.00,22.00 - World: (-144,9,22), Chunk: (at 0,0,6 in -9,1; contains blocks -144,0,16 to -129,255,31), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Level time: 2950138 game time, 6000 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 33621 (now: false), thunder time: 77336 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.B(SourceFile:607)
at net.minecraft.server.MinecraftServer.A(SourceFile:535)
at bpo.A(SourceFile:152)
at net.minecraft.server.MinecraftServer.run(SourceFile:451)
at java.lang.Thread.run(Thread.java:695)

-- System Details --
Details:
Minecraft Version: 1.8.8
Operating System: Mac OS X (x86_64) version 10.7.5
Java Version: 1.6.0_65, Apple Inc.
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
Memory: 136195320 bytes (129 MB) / 299069440 bytes (285 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 5 total; -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [lf['DarkPineapple58'/33, l='Map', x=-340.92, y=10.00, z=-2.42]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

The crash report has been added