Azure Text Analytic Service returning error

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Azure

C#5.0

Hi All,

I'm trying to consume Microsoft Azure Text Analytic service (https://goo.gl/ejaqMA[^]) whose document can be found at https://goo.gl/SBdH4H[^]

I'm using the following code

try
           {
               var actionURI = new Uri("https://api.datamarket.azure.com/data.ashx/amla/text-analytics/v1/GetKeyPhrases");
               DataServiceContext context = new DataServiceContext(actionURI);
               var accountKey = "testkey";
               var cred = new NetworkCredential(accountKey, accountKey);
               var cache = new CredentialCache();
               cache.Add(actionURI, "Basic", cred);
               context.Credentials = cache;

               DataServiceQuery<string> query = context.CreateQuery<string>("GetKeyPhrases");
               query.AddQueryOption("Text", string.Concat("\'", System.Uri.EscapeDataString("Hello World"), "\'"));

               List<string> test = query.Execute().ToList<string>();

           }
           catch (Exception ex)
           {
               Console.WriteLine(ex.Message);
           }

But I'm always getting the following error after the Execute() method

InnerException = "The request was not accepted by the data provider's service. The team is investigating the issue. We are sorry for the inconvenience."

Can anyone please point me where I'm making the mistake?