Server.exe problem

 using (var db = new Database())

System.Net.HttpListenerException: Access is denied
   at System.Net.HttpListener.AddAllPrefixes()
   at System.Net.HttpListener.Start()
   at server.Program.Main(String[] args) in c:\Users\AWong\Desktop\PhoenixRealms-master-master\server\Program.cs:line 23

11        private const int port = 8888;
12        private static HttpListener listener;
13        private static Thread listen;
14        private static readonly Thread[] workers = new Thread[5];
15        private static readonly Queue<HttpListenerContext> contextQueue = new Queue<HttpListenerContext>();
16        private static readonly object queueLock = new object();
17        private static readonly ManualResetEvent queueReady = new ManualResetEvent(false);
18
19        private static void Main(string[] args)
20        {
21            listener = new HttpListener();
22            listener.Prefixes.Add("http://*:" + port + "/");
23            listener.Start();