Structure '{0}' has field '{1}' of type '{2}'. '{2}' is not a valid Windows Runtime field type. Each field in a Windows Runtime ...

Structure '{0}' has field '{1}' of type '{2}'. '{2}' is not a valid Windows Runtime field type. Each field in a Windows Runtime structure can only be UInt8, Int16, UInt16, Int32, UInt32, Int64, UInt64, Single, Double, Boolean, String, Enum, or itself a structure.