Error 1 error MSB8020: The build tools for v140_xp (Platform Toolset = 'v140_xp') cannot be found. To build using the v140_xp build tools, please install v140_xp build tools. Alternatively, you may upgrade to the current Visual Studio tools by selecting the Project menu or right-click the solution, and then selecting "Upgrade Solution...". C:\Program Files (x86)\MSBuild\Microsoft.Cpp\v4.0\V120\Microsoft.Cpp.Platform.targets 64 5 EffectLib