VS2015: warning MSB3884: Could not find rule set file

Question

After upgrading my WinForms VS2013 project to VS2015, I started seeing the MSB3884 \"Could not find rule set file\" warning.

A Google search turned up one MSDN article,

Answer 1

I hit this warning after migrating from VS 2013 to VS 2015 as well. In my case the error was Could not find rule set file "AllRules.ruleset". The fix for me was to change the VisualStudioVersion setting in the .csproj file to be 14.0 so that it looks in the correct rule set folder:

After that and a rebuild, the warning was resolved. Much easier.