Update error-message-user-cancelled-the-operation.md

Author: ztyyLV

faq/error-message-user-cancelled-the-operation.md

@@ -15,3 +15,13 @@ permalink: /faq/error-message-user-cancelled-the-operation.html
 
 ### Symptom
 
+You may encounter the error "user cancelled the operation" after successfully scanning all pages. But you can still run the application normally.
+
+### Cause
+
+This happened frequently if you use the WIA driver instead of TWAIN driver. Our SDK is developed based on the TWAIN protocol, therefore the performance in WIA driver cannot be guaranteed.
+
+### Resolution
+
+- **If you want to continue with WIA driver:**
+You can ignore the error message since it won't affect the actual usage, Dynamsoft is planning to fix the issue at v18.2. In v18.2, Dynamic Web TWAIN will start to support WIA driver.