So I'm pretty new to UDK and I have no idea what's wrong. I was editing this map 1-2 days ago but now when I try to open JustUs.udk it instantly crashes.

Here's the log file

Code:
Log: Log file open, 04/06/12 11:59:35
Init: WinSock: version 1.1 (2.2), MaxSocks=32767, MaxUdp=65467
DevConfig: GConfig::LoadFile associated file:  ..\..\UDKGame\Config\UDKCompat.ini
DevConfig: GConfig::Find has loaded file:  ..\..\Engine\Config\ConsoleVariables.ini
Init: Version: 9656
Init: Epic Internal: 0
Init: Compiled (32-bit): Mar 20 2012 19:27:46
Init: Changelist: 1202061
Init: Command line: editor 
Init: Base directory: C:\UDK\UDK-2012-03\Binaries\Win32\
[0000.40] Init: Computer: JM4B7L1
[0000.40] Init: User: Administrator
[0000.40] Init: CPU Page size=4096, Processors=8
[0000.40] Init: High frequency timer resolution =3.579545 MHz
[0000.40] Init: Memory total: Physical=2.9GB (3GB approx) Pagefile=4.8GB Virtual=2.0GB
[0000.40] Log: Steam Client API Disabled!
[0000.44] Init: WinSock: I am JM4B7L1 (193.11.11.137:0)
[0000.44] Init: Presizing for 0 objects not considered by GC, pre-allocating 0 bytes.
[0000.44] Init: Object subsystem initialized
[0000.47] Log: Shader platform (RHI): PC-D3D-SM3
[0000.64] Log: PhysX GPU Support: DISABLED
[0000.64] Init: Initializing FaceFX...
[0000.64] Init: FaceFX 1.7.4 initialized.
[0004.29] Init: Finished loading startup packages in 3.44 seconds
[0004.31] Log: 79389 objects as part of root set at end of initial load.
[0004.31] Log: 0 out of 0 bytes used by permanent object pool.
[0006.48] Log: Supported Consoles:
[0006.48] Log:   IPhone
[0006.48] Log:   Mac
[0006.48] Log:   PC
[0006.48] Log: Initializing Engine...
[0006.65] Log: Encountered missing default brush - spawning new one
[0006.66] Init: UEngine initialized
[0006.66] Log: Primary PhysX scene will be in software.
[0006.66] Log: Creating Primary PhysX Scene.
[0006.67] Init: Transaction tracking system initialized
[0006.72] Log: Can't find edit package 'OnlineSubsystemGameSpy'
[0006.72] Log: Can't find edit package 'OnlineSubsystemLive'
[0008.27] Init: XAudio2 using 'IDT Audio' : 2 channels at 44.1 kHz using 16 bits per sample (channel mask 0x3)
[0008.30] Init: XAudio2Device initialized.
[0008.42] Log: WinTab initalized successfully.
[0008.42] Init: Client initialized
[0008.42] Init: Editor engine initialized
[0008.69] Log: Initializing Engine Completed
[0008.69] Log: >>>>>>>>>>>>>> Initial startup: 8.69s <<<<<<<<<<<<<<<
[0008.78] Cmd: MODE MAPEXT=udk
[0008.91] SourceControl: Source Control disabled in UDKEditorUserSettings.ini.  [SourceControl] has Disabled=True
[0012.69] Cmd: MAP LOAD FILE="..\..\Engine\Content\Maps\Templates\Template_MidDay.umap" TEMPLATE=0
[0012.98] Log: Encountered missing default brush - spawning new one
[0013.21] Log: New File, Existing Package (Package Untitled_2, Package Template_MidDay)
[0013.29] Log: -- Checking Building LODs
[0013.29] Log: Primary PhysX scene will be in software.
[0013.34] Log: Creating Primary PhysX Scene.
[0013.35] Log: Finished looking for orphan Actors (0.003 secs)
[0013.36] Cmd: MAP CHECKDEP DONTCLEARMESSAGES DONTDOSLOWREFCHECK
[0013.36] Log: TIMER ALL OF INIT : [12.705697]
[0022.34] Cmd: MAP LOAD FILE="C:\UDK\UDK-2012-03\UDKGame\Content\Maps\JustUs.udk" TEMPLATE=0
[0022.43] Log: Encountered missing default brush - spawning new one
[0022.55] Critical: appError called: Failed to find object 'World JustUs.TheWorld'
[0022.55] Critical: Windows GetLastError: The system cannot find the file specified. (2)
[0024.95] Log: === Critical error: ===
Failed to find object 'World JustUs.TheWorld'

Address = 0x7c812afb (filename not found) 
Address = 0x5d34b1   (filename not found) 
Address = 0x6c0069   (filename not found) 
Address = 0xfdf0e814 (filename not found)
I take it that the last sentences are the cause of my problem, but how can udk fail to find my map? I just showed it.
Any help is appreciated.