diff --git a/v2rayN/v2rayUpgrade/MainForm.cs b/v2rayN/v2rayUpgrade/MainForm.cs
index 966a4c77..281f5d4b 100644
--- a/v2rayN/v2rayUpgrade/MainForm.cs
+++ b/v2rayN/v2rayUpgrade/MainForm.cs
@@ -62,9 +62,9 @@ namespace v2rayUpgrade
                     }
                 }
             }
-            catch
+            catch (Exception ex)
             {
-                MessageBox.Show("Upgrade Failed(升级失败)");
+                MessageBox.Show("Upgrade Failed(升级失败)." + ex.StackTrace);
                 return;
             }