I actually ran your project and got the issue loading it myself, and figured out the simple fix is to completely delete the original package references… then re-add them from nuget. The original build from xamarin includes what seems to be a broken linux package that doesnt fix with just updating it so again, just remove it, re-add both linux and windows and you shouldnt have any problems. I did so in your project to make sure it wasnt just something from my own installation.