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So, I was trying to build a skyblock map for my server. I used mcedit to delete the chunks, built an island, and it was working fine. When I finished the island, I wanted to make more, so I logged off the world, went into MCEdit, and copied the island. I thought I pasted it, and I logged off of the world in MCEdit. I couldn't find the islands, so I got out a map and opened it. Nothing showed up.
I went back into MCEdit, selected the island again, and realized you had to hit enter to actually paste in the islands.
I logged off.
Back to my game! I log on to the world- crash.
Okay... publish report, log back in, go onto the world-crash.
I did this about five times (even did the power cycle, like that would help ) And then I came here.
What do I do?! INVEdit doesn't work for me!
So pie. Please help.

Crash report: (Of course I got the WarGames one!)

---- Minecraft Crash Report ----
// Shall we play a game?

Time: 3/6/14 4:50 PM
Description: Exception ticking world

java.lang.IllegalArgumentException: n must be positive
at java.util.Random.nextInt(Random.java:250)
at agr.a(SourceFile:122)
at agr.a(SourceFile:27)
at agl.a(SourceFile:364)
at agu.a(SourceFile:42)
at apq.a(SourceFile:432)
at ml.a(SourceFile:160)
at aoo.a(SourceFile:772)
at ml.c(SourceFile:95)
at ml.d(SourceFile:108)
at afs.e(SourceFile:311)
at mm.g(SourceFile:234)
at mm.b(SourceFile:137)
at net.minecraft.server.MinecraftServer.u(SourceFile:502)
at net.minecraft.server.MinecraftServer.t(SourceFile:440)
at btk.t(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:357)
at lb.run(SourceFile:616)


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

-- Head --
Stacktrace:
at java.util.Random.nextInt(Random.java:250)
at agr.a(SourceFile:122)
at agr.a(SourceFile:27)
at agl.a(SourceFile:364)
at agu.a(SourceFile:42)
at apq.a(SourceFile:432)
at ml.a(SourceFile:160)
at aoo.a(SourceFile:772)
at ml.c(SourceFile:95)
at ml.d(SourceFile:108)
at afs.e(SourceFile:311)
at mm.g(SourceFile:234)
at mm.b(SourceFile:137)

-- Affected level --
Details:
Level name: Testingskyblock
All players: 1 total; [mp['Audz100'/41697, l='Testingskyblock', x=-48.07, y=91.92, z=-10.00]]
Chunk stats: ServerChunkCache: 737 Drop: 0
Level seed: 7450151855772516352
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: World: (0,1,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 9930 game time, 9930 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 106228 (now: false), thunder time: 60831 (now: false)
Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.u(SourceFile:502)
at net.minecraft.server.MinecraftServer.t(SourceFile:440)
at btk.t(SourceFile:117)
at net.minecraft.server.MinecraftServer.run(SourceFile:357)
at lb.run(SourceFile:616)

-- System Details --
Details:
Minecraft Version: 1.7.4

Anyone?

Please help!

Come on, can anyone help me here? At least, is there any way for me to get my book's file back?
(Yes, I wrote a book and quill).

Well, thanks for nothing, minecraft wiki.