This content has 3 years. Some of the information in this post may be out of date or no longer work. Please, read this page keeping its age in your mind.If your Xamarin Android, iOS or UWP application is not starting when you are hitting the Run or F5 button, then probably your Build configurations are misconfigured. This usually happens when you are opening a too old source code. No worries, we will have a solution for it. Solution