I'm trying to get a solution to load that I downloaded but the projects give this error when I try to load them:
[path to .csproj] : error : Value cannot be null. Parameter name: url
I've scoured the two csproj files for any missing fields but can't find any.
The csproj files are too big to paste here but can be found here: https://github.com/Esri/arcgis-runtime-samples-dotnet/tree/master/src/Store at revision 28213de.
I uninstalled Visual Studio and reinstalled with Windows 8.1 SDK and it started working fine. Just modifying your install does not fix this issue, you MUST reinstall.