C#

Exception thrown: 'System.ArgumentException' in System.Web.Extensions.dll

    /// <param name="wUrl">The web service URL to call</param>
    /// <returns>An array of Card composed of the de-serialized JSON</returns>
    private Card[] GetWebServiceResult(string wUrl)
    {
        HttpWebRequest httpWReq = (HttpWebRequest)WebRequest.Create(wUrl);
        HttpWebResponse httpWResp = (HttpWebResponse)httpWReq.GetResponse();
        Card[] jsonResponse = null;

        try
        {
            //Test the connection
            if (httpWResp.StatusCode == HttpStatusCode.OK)
            {

                Stream responseStream = httpWResp.GetResponseStream();
                string jsonString = null;

                //Set jsonString using a stream reader
                using (StreamReader reader = new StreamReader(responseStream))
                {
                    jsonString = reader.ReadToEnd().Replace("\\", "");
                    reader.Close();
                }

                //Deserialize our JSON
                JavaScriptSerializer sr = new JavaScriptSerializer();
                
                /*CODE FAILS HERE*/
                jsonResponse = sr.Deserialize<Card[]>(jsonString);

            }
            //Output connection error message
            else
            {
                FailComponent(httpWResp.StatusCode.ToString());

            }
        }
        //Output JSON parsing error
        catch (Exception e)
        {
            FailComponent(e.ToString());
        }
        return jsonResponse;

    }

    /// <summary>
    /// Outputs error message
    /// </summary>
    /// <param name="errorMsg">Full error text</param>
    private void FailComponent(string errorMsg)
    {
        bool fail = false;
        IDTSComponentMetaData100 compMetadata = this.ComponentMetaData;
        compMetadata.FireError(1, "Error Getting Data From Webservice!", errorMsg, "", 0, out fail);

    }

}
#endregion

#region JSON Class

public class ImageUris
{
    public string small { get; set; }
    public string normal { get; set; }
    public string large { get; set; }
    public string png { get; set; }
    public string art_crop { get; set; }
    public string border_crop { get; set; }
}

public class Legalities
{
    public string standard { get; set; }
    public string future { get; set; }
    public string frontier { get; set; }
    public string modern { get; set; }
    public string legacy { get; set; }
    public string pauper { get; set; }
    public string vintage { get; set; }
    public string penny { get; set; }
    public string commander { get; set; }
    public string __invalid_name__1v1 { get; set; }
    public string duel { get; set; }
    public string brawl { get; set; }
}

public class RelatedUris
{
    public string tcgplayer_decks { get; set; }
    public string edhrec { get; set; }
    public string mtgtop8 { get; set; }
}

public class PurchaseUris
{
    public string amazon { get; set; }
    public string ebay { get; set; }
    public string tcgplayer { get; set; }
    public string magiccardmarket { get; set; }
    public string cardhoarder { get; set; }
    public string card_kingdom { get; set; }
    public string mtgo_traders { get; set; }
    public string coolstuffinc { get; set; }
}

public class AllPart
{
    public string @object { get; set; }
    public string id { get; set; }
    public string name { get; set; }
    public string uri { get; set; }
}

public class Datum
{
    public string @object { get; set; }
    public string id { get; set; }
    public string oracle_id { get; set; }
    public List<object> multiverse_ids { get; set; }
    [JsonProperty("name")]
    public string Name { get; set; }
    [JsonProperty("uri")]
    public string Uri { get; set; }
    public string scryfall_uri { get; set; }
    public string layout { get; set; }
    public bool highres_image { get; set; }
    public ImageUris image_uris { get; set; }
    public double cmc { get; set; }
    public string type_line { get; set; }
    public string oracle_text { get; set; }
    public string mana_cost { get; set; }
    public string loyalty { get; set; }
    public List<object> colors { get; set; }
    public List<object> color_identity { get; set; }
    public Legalities legalities { get; set; }
    public bool reserved { get; set; }
    public bool reprint { get; set; }
    public string set { get; set; }
    public string set_name { get; set; }
    public string set_uri { get; set; }
    public string set_search_uri { get; set; }
    public string scryfall_set_uri { get; set; }
    public string rulings_uri { get; set; }
    public string prints_search_uri { get; set; }
    public string collector_number { get; set; }
    public bool digital { get; set; }
    public string rarity { get; set; }
    public string illustration_id { get; set; }
    public string artist { get; set; }
    public string frame { get; set; }
    public bool full_art { get; set; }
    public string border_color { get; set; }
    public bool timeshifted { get; set; }
    public bool colorshifted { get; set; }
    public bool futureshifted { get; set; }
    public int edhrec_rank { get; set; }
    public RelatedUris related_uris { get; set; }
    public PurchaseUris purchase_uris { get; set; }
    public string flavor_text { get; set; }
    public string usd { get; set; }
    public int? story_spotlight_number { get; set; }
    public string power { get; set; }
    public string toughness { get; set; }
    public List<AllPart> all_parts { get; set; }
    public string eur { get; set; }
    public string watermark { get; set; }
}

public class Card
{
    public string @object { get; set; }
    public int total_cards { get; set; }
    public bool has_more { get; set; }
    public string next_page { get; set; }
    public List<Datum> data { get; set; }
}

#endregion