Bug visual studio

J'ai un bug avec visual studio qui ne veut plus lancer mes application xamarin. Il me donne comme erreur:
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).

Additionally, check Build->Configuration Manager to ensure this project is set to Deploy for this configuration.

Je dois faire d'urgence une application android. Petit budget. Merci de me donner vos meilleur bas prix