Xamarin - Android - The application could not be started

Jan 17, 2016

Android application is debugging. The application could not be started. Ensure that the application has been installed to the target device and has a launchable activity (MainLauncher = true).

The above error is one I often seem to see when trying to debug Android apps, despite the fact I do have a launchable activity. If I try and do a simple deployment I get a bit more information along the lines of:

[INSTALL_FAILED_UPDATE_INCOMPATIBLE]

Even though the app had been uninstalled, some data seems to get left behind. In this case I just re-install an old apk and uninstall again, which clears the error.