Notice (2018-05-24): bugzilla.xamarin.com is now in
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Created attachment 19447 [details]
Screenshot of error - unable to copy
System.NullReferenceException in Forms.Previewer when Mobile Center is included.
See attached image.
Could you please try to move your MobileCenter initialisation to the OnStart event, as a workaround?
Usually these 2 lines..
MobileCenter.Start (typeof (Analytics), typeof (Crashes));
MessagingCenter.Subscribe<object, Exception> (this, Messages.ExceptionOccurred, OnAppExceptionOccurred);
Because we have not received a reply to our request for more information in over 4 weeks, we are closing this issue. If you are still encountering this issue, please reopen the ticket with the requested information. Thanks!