I have been working on this little mobile app for android using Xamarin in Visual Studio 2017.
When opening the solution with the laptop that I used to develop the a
You may be using an older version of Visual Studio on the PC you've facing the issue. I've faced that too.
It was a known bug (reported here and here) already fixed on newer versions.
The workaround is to close VS, delete the folder vs
created in the same directory of your solution and try to reopen it.
To avoid other problems on compiling or running your app after that, I recommend you also to delete all bin
and obj
folders from your project's folders, clean and rebuild the solution.
It's safer keep all your development environments updated in software wise to avoid this kind of trouble.
I hope it helps.