Migrating to .Net Standard 2.0 is causing errors

Hi,

I have Migrated my existing PCL project to netstandard and now I am getting this error:

**/Users/jassim/Projects/ZayedAlKhair/packages/Xamarin.Forms.2.4.0.280/build/netstandard1.0/Xamarin.Forms.targets(3,3): Error MSB4062: The "Xamarin.Forms.Build.Tasks.FixedCreateCSharpManifestResourceName" task could not be loaded from the assembly /Users/jassim/Projects/ZayedAlKhair/packages/Xamarin.Forms.2.4.0.280/build/netstandard1.0/Xamarin.Forms.Build.Tasks.dll. Confirm that the declaration is correct, that the assembly and all its dependencies are available, and that the task contains a public class that implements Microsoft.Build.Framework.ITask. (MSB4062) (ZayedNotificationServiceExtension)
**

Kindly help..

Thanks,
Jassim