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ok, so I am messing around with Command blocks and whatnot, trying to make an adventure map. I've been working on it for a while, and was trying to put in some Hidden Items. I wanted to have these Items have Modifiers, so I was trying to spawn one in and this happened:

// Would you like a cupcake?Time: 6/27/14 10:00 AMDescription: Ticking playerjava.lang.IllegalArgumentException: Modifier name cannot be emptyat org.apache.commons.lang3.Validate.notEmpty(Validate.java:398)at ti.(SourceFile:29)at yi.a(SourceFile:94)at adc.D(SourceFile:598)at su.h(SourceFile:1200)at yy.h(SourceFile:240)at mv.i(SourceFile:206)at ng.a(SourceFile:210)at jd.a(SourceFile:137)at jf.a(SourceFile:20)at ej.a(SourceFile:174)at nb.c(SourceFile:134)at net.minecraft.server.MinecraftServer.v(SourceFile:540)at net.minecraft.server.MinecraftServer.u(SourceFile:453)at bvj.u(IntegratedServer.java:186)at net.minecraft.server.MinecraftServer.run(SourceFile:369)at li.run(SourceFile:628)A detailed walkthrough of the error, its code path and all known details is as follows:----------------------------------------------------------------------------------------- Head --Stacktrace:at org.apache.commons.lang3.Validate.notEmpty(Validate.java:398)at ti.(SourceFile:29)at yi.a(SourceFile:94)at adc.D(SourceFile:598)at su.h(SourceFile:1200)at yy.h(SourceFile:240)-- Player being ticked --Details:Entity Type: null (mv)Entity ID: 0Entity Name: Grapz224Entity's Exact location: 654.97, 56.00, -250.71Entity's Block location: World: (654,56,-251), Chunk: (at 14,3,5 in 40,-16; contains blocks 640,0,-256 to 655,255,-241), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)Entity's Momentum: 0.00, -0.08, 0.00Stacktrace:at mv.i(SourceFile:206)at ng.a(SourceFile:210)at jd.a(SourceFile:137)at jf.a(SourceFile:20)at ej.a(SourceFile:174)-- Ticking connection --Details:Connection: [email protected]:at nb.c(SourceFile:134)at net.minecraft.server.MinecraftServer.v(SourceFile:540)at net.minecraft.server.MinecraftServer.u(SourceFile:453)at bvj.u(IntegratedServer.java:186)at net.minecraft.server.MinecraftServer.run(SourceFile:369)at li.run(SourceFile:628)-- System Details --Details:Minecraft Version: 1.7.9Operating System: Linux (amd64) version 3.11-2-amd64Java Version: 1.7.0_21, Oracle CorporationJava VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle CorporationMemory: 282211864 bytes (269 MB) / 396886016 bytes (378 MB) up to 954466304 bytes (910 MB)JVM Flags: 1 total; -Xmx1GAABB Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) usedIntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0Profiler Position: N/A (disabled)Vec3 Pool Size: 0 (0 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) usedPlayer Count: 1 / 8; [mv['Grapz224'/0, l='Superflat', x=654.97, y=56.00, z=-250.71]]Type: Integrated Server (map_client.txt)Is Modded: Very likely; Jar signature invalidated

I know what happened ( I think ) I just need to know, how do I clear my inventory from the files? I have tried fixing it like one would fix a corrupted world, but it doesnt work.I really need help... I've tried deleting player.dat, that wont work, and I REALLY dont want to lose this world!

Your personal inventory is in level.dat along with other things, so you do NOT want to just delete it.
Use NBTEdit or an inventory editor to do surgery on it.