Fail To Generate Project files

im trying to generate visual studio project files from third person blueprint template and i got this error

Fail To Generate Project files

Running D:/Program Files/Unreal Engine/4.2/Engine/Binaries/DotNET/UnrealBuildTool.exe -projectfiles -project=“D:/Documents/Unreal Projects/testbuild/testbuild.uproject” -game -rocket -progress
Discovering modules, targets and source code for game…
UnrealBuildTool Exception: ERROR: Directory ‘D:\Documents\Unreal Projects\testbuild’ is missing ‘Source’ folder.

im using unreal 4.2


If you start with a Blueprint template, you will not be able to see any source code until you add a class to your project. The first time you add a class to a Blueprint project, all of the Visual Studio files are created, as well as the default source code files.