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Simple Protobuf-net code failing in MonoDroid with 'No serializer defined for type'
[ProtoContract]
public class SSDTO {
    [ProtoMember(1)]
    public Dictionary<string, string> Strings = new Dictionary<string, string>(50);

    [ProtoMember(2)]
    public Dictionary<string, int> Ints = new Dictionary<string, int>(50);

    [ProtoMember(3)]
    public Dictionary<string, byte[]> Bytes = new Dictionary<string, byte[]>(10);
}

public class SettingStore {
    public event EventHandler ContentsChanged;

    private Dictionary<string, string> _StringVals;
    private Dictionary<string, int> _IntVals;
    private Dictionary<string, byte[]> _ByteVals;

    public SettingStore() {
        _StringVals = new Dictionary<string, string>(50);
        _IntVals = new Dictionary<string, int>(50);
        _ByteVals = new Dictionary<string, byte[]>(10);
    }

    private SettingStore(SSDTO source) {
        _StringVals = source.Strings;
        _IntVals = source.Ints;
        _ByteVals = source.Bytes;
    }

public static SettingStore DeSerialize(Stream data) {
        return new SettingStore(Serializer.Deserialize<SSDTO>(data));
    }

    public void Serialize(Stream Target) {
        Serializer.Serialize<SSDTO>(Target, toDTO());
    }

    private SSDTO toDTO() {
        return new SSDTO { Ints = this._IntVals, Strings = this._StringVals, Bytes = this._ByteVals };
    }

}