How to fix unknown cook failure - S_LightError

Clintmcc,

It looks like you’re having an animation sequence issue:

[2017.02.12-10.44.27:621][  0]LogOutputDevice:Warning: === Handled error: ===

Ensure condition failed: !bUseRawDataOnly [File:D:\Build\++UE4+Release-4.12+Compile\Sync\Engine\Source\Runtime\Engine\Private\Animation\AnimSequence.cpp] [Line: 325]

Stack: 
UE4Editor-Core.dll
UE4Editor-Core.dll
UE4Editor-Core.dll
UE4Editor-Engine.dll
UE4Editor-CoreUObject.dll
UE4Editor-CoreUObject.dll
UE4Editor-UnrealEd.dll
UE4Editor-UnrealEd.dll
UE4Editor-UnrealEd.dll
UE4Editor-UnrealEd.dll
UE4Editor-UnrealEd.dll
UE4Editor-Cmd.exe
UE4Editor-Cmd.exe
UE4Editor-Cmd.exe
UE4Editor-Cmd.exe
UE4Editor-Cmd.exe
KERNEL32.DLL
ntdll.dll
ntdll.dll

[2017.02.12-10.44.27:621][  0]LogOutputDevice:Error: 
end: stack for UAT