Hi there,
Background:
I was working on SlateWidget’s in unreal and may have mistakenly edited an unreal file - causing the build to recompile the entire engine.Yes careless, I know 
Problem:
The build itself (after a while) worked successfully with no errors. However upon opening the UE4 Editor- I get the following message:
Attempt:
I then opened up the UE4 Solution file and rebuilt ue4 - to see if that would maybe fix some things - and get the same message (hopeful but not surprised)
Here’s the log from the UE4 build:
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor.exe'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\ntdll.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\kernel32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\KernelBase.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-Core.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\dbghelp.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\msvcrt.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\advapi32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\sechost.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\rpcrt4.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\winmm.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\user32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\gdi32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\lpk.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\usp10.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\shell32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\shlwapi.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\ole32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\oleaut32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\netapi32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\netutils.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\srvcli.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\wkscli.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\IPHLPAPI.DLL'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\nsi.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\winnsi.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\setupapi.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\cfgmgr32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\devobj.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\dwmapi.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\imm32.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\msctf.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\xinput1_3.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\msvcp120.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\msvcr120.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\wer.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\version.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\psapi.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Windows\System32\powrprof.dll'. Cannot find or open the PDB file.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-CoreUObject.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-Projects.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-Engine.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-SlateCore.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-InputCore.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-VectorVM.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-ImageCore.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-RawMesh.dll'. Symbols loaded.
'UE4Editor.exe' (Win32): Loaded 'C:\Users\DarkRaveDev\Documents\GitHub\UnrealEngine-4.4\Engine\Binaries\Win64\UE4Editor-Navmesh.dll'. Symbols loaded.
The program '[3100] UE4Editor.exe' has exited with code -1073741520 (0xc0000130).
Question:
How do I solve this problem and how was it caused?