(SOLVED) Error with include layout, invalid reference (android)

Hello, I am new in android and xamarin studio depelopment.

I am having issues when I use the include layout tag.
The app compile well and I can run the app.
I think that this must be a xamarin studio issue or my project files are corrupt.

Using 4.2.2 (build 2) xamarin studio.

When I load one layout containing include tag in xamarin studio xaml wysiwyg editor the follow error message appears:

"The layout could not be loaded: You must specify a valid layout referece. The layout ID @layout/header is not valid."

I have a Resources/Layout/header.xml file.
But as I said, I compile the app and runs ok.
I searched info but I cant find nothing about the issue.

Any help will be apreciated.

Thanks.