Project not selected to build for this solution configuration

The error:

>------ Skipped Deploy: Project: DrawShape.Android, Configuration: Debug Any CPU ------
>Project not selected to build for this solution configuration 

The configuration in Configuration Manager seems correct:

This is the code of the project I am trying to build:

https://github.com/chrispellett/Xamarin-Forms-Shape

What I have tried so far:

Changing from Any CPU to x86 and back.

Setting the Build checkbox to false and then back to true.

As Kowalski said, You must check Deploy Option on Configuration Manager. RightClick on the solution and select Configuration Manager. Then Check Deploy Option for the startup Project. As this image

go To Build => Configuration Manager . then check the deploy checkbox for the startup project . Ps. make sure to select your startup project by right clicking on the project => set as startup project

Select Deploy also from Configuration Manager for android project