I've started seeing this message when I set the Configuration Manager to build for the ARM platform. The error output also reports that LayoutAwarePage does not existing in the namespace "using:<appname>.Common", and that the member Resources is not recognised or accessible. I'm unable to access the properties of any XAML object whilst VS2012 is in this state.
These problems go away if I switch the build back to x86 but that slows down development and also seems to trigger the wiping of the Local app storage on the Surface RT when I redeploy the app; that doesn't seem to happen if I keep the configuration manager set to ARM but then I can't do any XAML work.
Any thoughts on what might have caused this or how I can try and determine what has happened? I've gone back over the source history to see what has changed but I'm not seeing anything that occurs to me as a possible cause.
Philip