Why is my project crashing on open?

So 2 days ago everything was working fine. I saved my project and put my computer to sleep. Today I try and open my project and this is what I get every time:

We apologize for the inconvenience.
Please send this crash report to help
improve our software.

9c26e3bf5ceff148b933522aff1de581

Whenever this has happened to me it is when I am trying to reference an asset in my game directory that isn’t there in C++ are you doing anything similar? For example trying to reference a class blueprint or material?

Mmm, I suppose it is possible but how would I fix it if I was? I work in BP though, so I don’t even know how that would happen.

Found this in the logs:

[2014.05.13-10.50.48:657][ 0]LogInit:Warning: We appear to have no tool tip localization data? Editor can’t run.
[2014.05.13-10.50.48:657][ 0]LogInit:Warning: We appear to have no property name localization data? Editor can’t run.

Also:

[2014.05.13-10.50.51:211][ 0]LogParticles: Destroying 0 GPU particle simulations for FXSystem 0x0000000015F034C0
[2014.05.13-10.50.51:587][ 0]LogBlueprint:Error: [compiler] Error Function ‘Terraform Regenerator’ called from Terraform Regenerator should not be called from a Blueprint
[2014.05.13-10.50.51:588][ 0]LogBlueprint:Warning: [compiler] Warning [0003.67] Compile of Tile_Parent failed. 1 Fatal Issue(s) 0 Warning(s) [in 1 ms]

Also getting tons of this:

[2014.05.13-10.50.51:836][ 0]LogWindows: Assertion failed: ChildClass->GetSuperClass() == ClassToReinstance || ChildClass->GetSuperClass() == DuplicatedClass [File:D:\BuildFarm\buildmachine_++depot+UE4-Releases+4.1\Engine\Source\Editor\UnrealEd\Private\Kismet2\KismetReinstanceUtilities.cpp] [Line: 506]

Stack:
Address = 0xefd43f36 (filename not found) [in C:\Program Files\Unreal Engine\4.1\Engine\Binaries\Win64\UE4Editor-Core.dll]

Address = 0xefbe2bb5 (filename not found) [in C:\Program Files\Unreal Engine\4.1\Engine\Binaries\Win64\UE4Editor-Core.dll]

Address = 0xef817024 (filename not found) [in C:\P

[2014.05.13-10.50.51:836][ 0]LogExit: Executing StaticShutdownAfterError

Re-installing the editor didn’t help. -_-

So I seem to have offended the Code Gods. Refer to this thread for the cause: Why won't my 3 separate Blueprints compile? - Audio - Unreal Engine Forums