"Could not install package Xamarin.Forms" when creating a new blank Xamarin.Forms project

Hello,

When creating a new blank Xamarin.Forms project (either using VisualStudio or XamarinStudio)
I get the error "Could not install package Xamarin.Forms "

"Xamarin.Forms.13.3.6323 : Could not install package Xamarin.Forms (either 1.3.. or 1.5...)
You are trying to install this package into a project that targets
`portable-net45+dnxcore50+win+wp80+MonoAndroid10+xamarinios10+MonoTouch10' but
the package does not contain any assembly references or content files that are
compatible with that farmework. For more information, contact the package
author. "