ReSharper Warning : Invalid type: expected type is 'double', actual type is 'OnPlatfrom'

Hi

I'm getting ReSharper warning in my XAML file as Invalid type: expected type is 'double', actual type is 'OnPlatfrom'.

I have changed my code from old (deprecated) method

<OnPlatform x:TypeArguments="x:Double" iOS="60" Android="40" WinPhone="40" />

To

<OnPlatform x:TypeArguments="x:Double">
    <On Platform="iOS" Value="60" />
    <On Platform="Android" Value="40" />
    <On Platform="WinPhone" Value="40" />
</OnPlatform>

One main problem is that its not accepting the changes. So I revert back to the old one to make it work out.

I don't know its a valid warning. Correct me if I made anything wrong or tell me some solution. Thanks.