c# - Page navigation WP8.1 -


I have created an app for WP8 and I have a page navigation such as navigation service Navigate (new URI (...)) and worked well.
I am now trying to develop a WP8.1 app and can not understand how it is going.
I get the following error The name 'Navigation service' is not present in the current context. . I have two pages and I want to navigate between them.
How can I do this?
What changed?

To navigate to the main page. एक्सएमएल, you can use the frame navigational (typef (menopause));

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