If you have seen the following the following build errors within Xamarin Forms application…

“Build action 'EmbeddedResource' is not supported by one or more of the project's targets.”

The resolution is to open the properties on the xaml file, change the build action to something else other than Embedded Resource then change it back. 

The build error goes away and everything is good.  The error however does not stop building/running the solution however it can be avoided to.