Build ut4 failed

i want to build ut4,and try to study from the project, but when i build it ,it always show me the error:
C1071 : unexpected end of file found in comment
i am sure i have run the setup.bat, install UE4PrereqSetup_x64, and build the unrealswam
the environment of my computer is windows10, visual studio 2015, visual studio 2017, directx June 2010 runtime and sdk,

thanks very much