diff --git a/modules/cms-kit/src/Volo.CmsKit.Domain.Shared/Volo/CmsKit/Localization/Resources/en.json b/modules/cms-kit/src/Volo.CmsKit.Domain.Shared/Volo/CmsKit/Localization/Resources/en.json
index 126e084d26..9bb8dd275c 100644
--- a/modules/cms-kit/src/Volo.CmsKit.Domain.Shared/Volo/CmsKit/Localization/Resources/en.json
+++ b/modules/cms-kit/src/Volo.CmsKit.Domain.Shared/Volo/CmsKit/Localization/Resources/en.json
@@ -215,6 +215,7 @@
     "DeleteBlogPostMessage": "The blog will be deleted. Are you sure?",
     "CaptchaCode": "Captcha code",
     "CommentTextRequired": "Comment is required",
-    "CaptchaCodeErrorMessage" : "The answer you entered for the CAPTCHA was not correct. Please try again"
+    "CaptchaCodeErrorMessage" : "The answer you entered for the CAPTCHA was not correct. Please try again",
+    "CaptchaCodeMissingMessage": "The captcha code is missing!"
   }
 }
\ No newline at end of file
diff --git a/modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/CaptchaException.cs b/modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/CaptchaException.cs
deleted file mode 100644
index 7914e85b02..0000000000
--- a/modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/CaptchaException.cs
+++ /dev/null
@@ -1,15 +0,0 @@
-using System.Runtime.Serialization;
-using Volo.Abp;
-
-namespace Volo.CmsKit.Public.Web.Security.Captcha;
-
-public class CaptchaException : UserFriendlyException
-{
-    public CaptchaException(string message) : base(message)
-    {
-    }
-
-    public CaptchaException(SerializationInfo serializationInfo, StreamingContext context) : base(serializationInfo, context)
-    {
-    }
-}
\ No newline at end of file
diff --git a/modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/SimpleMathsCaptchaGenerator.cs b/modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/SimpleMathsCaptchaGenerator.cs
index e30a9d2e5a..220e24f892 100644
--- a/modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/SimpleMathsCaptchaGenerator.cs
+++ b/modules/cms-kit/src/Volo.CmsKit.Public.Web/Security/Captcha/SimpleMathsCaptchaGenerator.cs
@@ -95,7 +95,7 @@ public class SimpleMathsCaptchaGenerator : ISingletonDependency
         }
         else
         {
-            throw new CaptchaException("The captcha code is missing!");
+            throw new UserFriendlyException(_localizer["CaptchaCodeMissingMessage"]);
         }
     }