fix startup fail

SuperWebSocket/WebSocketServer.cs

@@ -138,7 +138,7 @@ namespace SuperWebSocket
         /// Initializes a new instance of the <see cref="WebSocketServer&lt;TWebSocketSession&gt;"/> class.
         /// </summary>
         public WebSocketServer()
-            : base()
+            : base(new WebSocketProtocol())
         {
 
         }