WP8 and NGraphics give an error

After XForms updates to 2.0 version WP8 project count't be compiled, error: Cannot resolve dependency to assembly 'Xamarin.Forms.Platform.WP8, Version=1.4.0.0, Culture=neutral, PublicKeyToken=null' because it has not been preloaded. When using the ReflectionOnly APIs, dependent assemblies must be pre-loaded or loaded on demand through the ReflectionOnlyAssemblyResolve event.

Reinstall all packages dont solve problem. Only removing NGraphics. But all my controls builded on it
Android and iOS worked.

Any ideas?

P.S. sorry for my english.