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I install on xamarin 4.0.12 mac packages "utilites for use with unity" and "SlightlySharper". After installing of packages and restarting xamarin throws error "Unable to run this add-in" and no name of package, no full path to package. Error: Error while evaluating condition 'PackageNotInstalled'. Exception System.NullReferenceException: no instance. This happens on each start of xamarin. Deleting of installed packages not helps.