try putting your checkout on a shorter file path, i.e. something short like D:/Dev/UE4 instead of a long file path such as *D:/Development/Engines/TestBranches/UnrealEngineNvidiaBranch/UE4 *
try putting your checkout on a shorter file path, i.e. something short like D:/Dev/UE4 instead of a long file path such as *D:/Development/Engines/TestBranches/UnrealEngineNvidiaBranch/UE4 *