add key="repositoryPath" value="..\Packages"
add key="repositoryPath" value=".\Packages"
This matches previously functional versions of MiniEngine. Might just be related to some internal changes that are not yet completely checked in.
Had same issue and found above solution didn't resolve the issue but copying the Packages directory one level down did resolve the issue. Thinking one of the projects got fixed and others did not....sigh.