Running C:/Program Files/Epic Games/UE_4.20/Engine/Binaries/DotNET/UnrealBuildTool.exe -projectfiles -project=“F:/UE4PRO/cpptest1/cpptest1.uproject” -game -rocket -progress
ERROR: UnrealBuildTool Exception: Unable to open log file for writing (C:\Program Files\Epic Games\UE_4.20\Engine\Programs\UnrealBuildTool\Log.txt)
Got the same exact same problem after installing 4.20.3…Re-installing some VS modules and 4.20 doesn’t do anything.
Seems others have concluded this is a whitespace problem with the username on the computer ( “Firstname -whitespace- Lastname”, and some have had success running the build tool from commandline and manually build the solution, but this feels like a tedious workaround.