diff --git a/ae/utils/ui_messagetype.py b/ae/utils/ui_messagetype.py
index 762d9e8..463cfc6 100644
--- a/ae/utils/ui_messagetype.py
+++ b/ae/utils/ui_messagetype.py
@@ -1,7 +1,6 @@
 from enum import Enum
 
 
-# class syntax
 class MessageType(Enum):
     PLAN = "plan"
     STEP = "step"
@@ -11,3 +10,4 @@ class MessageType(Enum):
     INFO = "info"
     FINAL = "final"
     DONE = "transaction_done"
+    ERROR = "error"