Showing flushing a couchbase bucket via API doesn't seem to work

app.config

<?xml version="1.0"?>
<configuration>
  <configSections>
    <section name="couchbase" type="Couchbase.Configuration.CouchbaseClientSection, Couchbase"/>
  </configSections>
  <couchbase>
    <servers bucket="general" bucketPassword="">
      <add uri="http://127.0.0.1:8091/pools"/>
    </servers>
  </couchbase>
</configuration>

output.txt

Successfully retrieved 372f498f-f98b-4f7a-b251-d13fd826c59a
Got 372f498f-f98b-4f7a-b251-d13fd826c59a data when expecting a cache miss

Program.cs

using System;
using Couchbase;
using Enyim.Caching.Memcached;

namespace TryToFlushCouchbaseBucket
{
    class Program
    {
        private static void Main(string[] args)
        {
            //create client object
            var couchbaseClient = new CouchbaseClient("couchbase");

            var randomKey = Guid.NewGuid().ToString();
            var randomData = Guid.NewGuid().ToString();

            //add a random key with some random data
            couchbaseClient.Store(StoreMode.Set, randomKey, randomData);

            var getResult = couchbaseClient.Get(randomKey);
            if (getResult == null || (getResult as string) != randomData)
            {
                Console.WriteLine("Could not get data that I just set...");
            }
            else
            {
                Console.WriteLine("Successfully retrieved {0}", getResult);
            }

            //now flush the bucket
            couchbaseClient.FlushAll();

            //now repeat the get
            getResult = couchbaseClient.Get(randomKey);
            if (getResult != null)
            {
                Console.WriteLine("Got {0} data when expecting a cache miss", getResult);
            }
            else
            {
                Console.WriteLine("Flush seemed to work");
            }

            Environment.Exit(0);
        }
    }
}

Hi. have you been found any solution for this? I can't flush too.