diff --git a/Interface/Base/ITaskAwaiter.cs b/Interface/Base/ITaskAwaiter.cs
index d35c81e..5119848 100644
--- a/Interface/Base/ITaskAwaiter.cs
+++ b/Interface/Base/ITaskAwaiter.cs
@@ -6,6 +6,6 @@
         public Exception Exception { get; }
 
         public ITaskAwaiter OnCompleted(Action action);
-        public ITaskAwaiter OnError(Action action);
+        public ITaskAwaiter OnError(Action<Exception> action);
     }
 }
diff --git a/Library/Common/Architecture/TaskAwaiter.cs b/Library/Common/Architecture/TaskAwaiter.cs
index 5507b0e..c528b51 100644
--- a/Library/Common/Architecture/TaskAwaiter.cs
+++ b/Library/Common/Architecture/TaskAwaiter.cs
@@ -50,7 +50,7 @@ namespace Milimoe.FunGame.Core.Library.Common.Architecture
         /// </summary>
         /// <param name="action"></param>
         /// <returns></returns>
-        public TaskAwaiter OnError(Action action)
+        public TaskAwaiter OnError(Action<System.Exception> action)
         {
             awaiter = awaiter.OnError(action);
             return this;
diff --git a/Service/TaskManager.cs b/Service/TaskManager.cs
index 64fc025..faff347 100644
--- a/Service/TaskManager.cs
+++ b/Service/TaskManager.cs
@@ -27,7 +27,7 @@ namespace Milimoe.FunGame.Core.Service
             public Exception Exception => _Exception;
 
             private delegate void CompletedEvent();
-            private delegate void ErrorEvent();
+            private delegate void ErrorEvent(Exception e);
             private event CompletedEvent? Completed;
             private event ErrorEvent? Error;
 
@@ -57,7 +57,7 @@ namespace Milimoe.FunGame.Core.Service
             /// </summary>
             /// <param name="action"></param>
             /// <returns></returns>
-            public ITaskAwaiter OnError(Action action)
+            public ITaskAwaiter OnError(Action<Exception> action)
             {
                 Error += new ErrorEvent(action);
                 return this;
@@ -74,7 +74,7 @@ namespace Milimoe.FunGame.Core.Service
                 catch (Exception e)
                 {
                     _Exception = e;
-                    Error?.Invoke();
+                    Error?.Invoke(e);
                 }
             }
 
@@ -89,7 +89,7 @@ namespace Milimoe.FunGame.Core.Service
                 catch (Exception e)
                 {
                     _Exception = e;
-                    Error?.Invoke();
+                    Error?.Invoke(e);
                 }
             }
         }