I was working on an Android project using Xamarin in Visual Studio 2012. I recently upgraded from an HDD to a SSD so I reinstalled Windows and all of my programs.
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adb uninstall did the trick. The strange thing is that even if you run the command to list all app that are installed it will not show up but if you run the uninstall command with ur package name which should be ur project name or name that you have assigned you will get the success result which means it got uninstalled and to check that if run the uninstall command again with same package name u will get failure command. Then deploying ur package again should work
I could not get this working, initially. Tried removing everything (Mono runtime, app, etc.), but to no avail.
What did work was renaming my package, which was fine in my case since I haven't release my apk yet. Some ghost version is obviously still stored on my unit.
I had the same error today, trying to run Xamarin Android-app on Xamarin Android Player. To fix it I needed to check the "x86" box at the "Supported architectures" section. So you might want check this section.