question

This is my code which works perfectly. When I add one more entry into title data like data.Add(GemsKey, "2"); It gives error: KeyNotFoundException: The given key was not present in the dictionary.

But if I replace one of existing entries with data.Add(GemsKey, "2"); It works fine too. Can anybody tell me whats the exact issue ? P.s: I'm using it on Unity3D...

    public static Dictionary<string, string> InitialUserData(bool fb)
    {
        Dictionary<string, string> data = new Dictionary<string, string>();
        data.Add(TotalEarningsKey, "0");
        data.Add(ChatsKey, "");
        data.Add(EmojiKey, "");
        if (fb)
        {
            data.Add(CoinsKey, StaticStrings.initCoinsCountFacebook.ToString());
            data.Add(AvatarIndexKey, "fb");
        }
        else
        {
            data.Add(CoinsKey, StaticStrings.initCoinsCountGuest.ToString());
            data.Add(AvatarIndexKey, "0");
        }


        data.Add(GamesPlayedKey, "0");
        data.Add(TwoPlayerWinsKey, "0");
        data.Add(FourPlayerWinsKey, "0");


        data.Add(TitleFirstLoginKey, "1");
        data.Add(FortuneWheelLastFreeKey, DateTime.Now.Ticks.ToString());
        return data;
    }