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The name "ContentPage" does not exist in the namespace "http://xamarin.com/schemas/2014/forms".

         
Most likely, the reason why you see those errors is that you are using the default XAML editor.
To fix this error try following:
1- Close all open documents.
2- From solution explorer, Right click on the *.XAML file you want to open.
3- Click on "Open With".
4- Click on "XML Text Editor".
5- Click on "Set as default" if you like.
Now you will be editing the file as normal XML file and errors should disappear.
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