diff --git a/samples/LiveChat/Commands/COMMAND_CON.cs b/samples/LiveChat/Commands/COMMAND_CON.cs
index 23dcad368..7bdc92b11 100644
--- a/samples/LiveChat/Commands/COMMAND_CON.cs
+++ b/samples/LiveChat/Commands/COMMAND_CON.cs
@@ -1,4 +1,4 @@
-
+using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 using SuperSocket;
@@ -17,7 +17,7 @@ public CON(RoomService roomService)
             _roomService = roomService;
         }
 
-        public async ValueTask ExecuteAsync(ChatSession session, StringPackageInfo package)
+        public async ValueTask ExecuteAsync(ChatSession session, StringPackageInfo package, CancellationToken cancellationToken)
         {
             session.Name = package.Body;
             await _roomService.EnterRoom(session);
diff --git a/samples/LiveChat/Commands/MSG.cs b/samples/LiveChat/Commands/MSG.cs
index 58b615483..ca3702f03 100644
--- a/samples/LiveChat/Commands/MSG.cs
+++ b/samples/LiveChat/Commands/MSG.cs
@@ -1,4 +1,4 @@
-
+using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.Extensions.Logging;
 using SuperSocket;
@@ -17,7 +17,7 @@ public MSG(RoomService roomService)
             _roomService = roomService;
         }
 
-        public async ValueTask ExecuteAsync(ChatSession session, StringPackageInfo package)
+        public async ValueTask ExecuteAsync(ChatSession session, StringPackageInfo package, CancellationToken cancellationToken)
         {
             await _roomService.BroadcastMessage(session, package.Body);
         }
diff --git a/samples/LiveChat/LiveChat.csproj b/samples/LiveChat/LiveChat.csproj
index da5a72b20..1c9cd4519 100644
--- a/samples/LiveChat/LiveChat.csproj
+++ b/samples/LiveChat/LiveChat.csproj
@@ -13,7 +13,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="SuperSocket.WebSocketServer" Version="2.0.0-beta.8" />
+    <ProjectReference Include="..\..\src\SuperSocket.WebSocket.Server\SuperSocket.WebSocket.Server.csproj" />  
   </ItemGroup>
 
   <ItemGroup>