diff --git a/damo.cs b/damo.cs
index eb17a4f..0b47f45 100644
--- a/damo.cs
+++ b/damo.cs
@@ -10,10 +10,16 @@ public class Damo
     public Damo()
     {
         obj = Type.GetTypeFromProgID("dm.dmsoft");
+
+        if (obj == null)
+            throw new InvalidOperationException(
+                "COM dm.dmsoft not found. Please verify that it is registered and that the project is set to x86.\"\r\n"
+            );
+
         obj_object = Activator.CreateInstance(obj);
     }
 
-    // 调用此接口进行com对象释放
+    // 璋冪敤姝ゆ帴鍙ｈ繘琛宑om瀵硅薄閲婃斁
     public void ReleaseObj()
     {
         if (obj_object != null)