BUILD ERROR! Anyone able to help? "UnrealBuildTool Failed"

Hi all,

I recently had an issue where my game won’t build anymore. It started after my computer lost connection to the server I was saving the builds and project on. Once I reconnected it just seemed to not want to work. I’ve managed to get the error down a bit by validating data and cooking the content but the initial build itself will not work anymore and this is very important we get something out soon. Does anyone have any ideas? This is the error in the output log.

UATHelper: Packaging (Windows (64-bit)): ERROR: UBT ERROR: Failed to produce item: \Unreal\X37\Binaries\Win64\X37.exe
UATHelper: Packaging (Windows (64-bit)):
PackagingResults: Error: UBT ERROR: Failed to produce item: \Unreal\X37\Binaries\Win64\X37.exe
UATHelper: Packaging (Windows (64-bit)): Total build time: 54.63 seconds (Parallel executor: 0.00 seconds)
UATHelper: Packaging (Windows (64-bit)): Took 55.1399562s to run UnrealBuildTool.exe, ExitCode=5
UATHelper: Packaging (Windows (64-bit)): ERROR: UnrealBuildTool failed. See log for more details. (C:\Users\jxb.GSS\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_4.21\UBT-X37-Win64-Development_2.txt)
UATHelper: Packaging (Windows (64-bit)):
PackagingResults: Error: UnrealBuildTool failed. See log for more details. (C:\Users\jxb.GSS\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_4.21\UBT-X37-Win64-Development_2.txt)
UATHelper: Packaging (Windows (64-bit)): AutomationTool exiting with ExitCode=5 (5)
UATHelper: Packaging (Windows (64-bit)): BUILD FAILED
PackagingResults: Error: Unknown Error

Fatal error: [File:Unknown] [Line: 826]
Rendering thread exception:
Fatal error!

Unhandled Exception: EXCEPTION_ACCESS_VIOLATION reading address 0xabcddcc8

0x00007ffd3b051d81 igd10iumd64.dll!UnknownFunction []
0x00007ffd40003b49 d3d11.dll!UnknownFunction []
0x00007ffd41c54f64 dxgi.dll!UnknownFunction []
0x00007ffd400c0f4a d3d11.dll!UnknownFunction []
0x00007ffd400d5910 d3d11.dll!UnknownFunction []
0x00007ff66c0be682 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c0d4f14 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c0cacd2 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c62653b FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c61d840 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c796dee FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c799df9 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66bb97de3 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c649922 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66c6499a8 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66bcab9a7 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ff66bcab859 FortniteClient-Win64-Shipping.exe!UnknownFunction []
0x00007ffd44033034 KERNEL32.DLL!UnknownFunction []
0x00007ffd46bf1471 ntdll.dll!UnknownFunction []