I had the same issue. It was fixed by adding perserve markup to our root link.xml
<assembly fullname="Apple.Core" ignoreIfMissing="1" preserve="all"/>
dirtyrectangle
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GameKit bug: Default constructor not found for type Apple.Core.Runtime.NSMutableArrayString
i think this can be fixed by adding perserve markup to your project main link.xml
<assembly fullname="Apple.Core" ignoreIfMissing="1" preserve="all"/>
You may be able to fix this by adding this markup to the projects main link.xml file
<assembly fullname="Apple.Core" ignoreIfMissing="1" preserve="all"/>