I've just loaded the solution from Peony.zip to Visual Studio 2019 and tried to compile it without no changes. It doesnot compile. I tried all ways to fix it, for example https://support.microsoft.com/en-us/help/148652/a-lnk2005-error-occurs-when-the-crt-library-and-mfc-libraries-are-link, it doesnot work in your project. Please help.