SharePoint App Deployment error : 'Failed to install app for SharePoint' There was a problem with activating the app web definition

It is because SharePoint is trying to activate your app as a standard SharePoint feature, when its really an App.

In the features folder of the SharePoint project, there will be a Feature named Feature1.

Open Feature1 and ensure it's contained in the "Items in the solution" list and not in the "Items in the feature" list.

After that you should be able to deploy.