diff --git a/src/Error.cpp b/src/Error.cpp
index e0fe98a..2e5f4fd 100644
--- a/src/Error.cpp
+++ b/src/Error.cpp
@@ -193,7 +193,8 @@ const std::vector<ErrorType> ts::availableErrors = {
 
         {0x1300, "group_invalid_id"                     , "Invalid group id"                                           },
         {0x1301, "group_name_inuse"                     , "Group name is already in use"                               },
-        {0x1302, "group_not_assigned_over_this_server"  , "the group hasn't been assigned over this server"            },
+        define_error_description(group_not_assigned_over_this_server, "the group hasn't been assigned over this server"),
+        define_error_description(group_not_empty, "the target group isn't empty"),
 
         {0xE000, "resource_limit_reached"               , "resource limit reached"                                     },
 
diff --git a/src/Error.h b/src/Error.h
index 27cc0b1..9036de6 100644
--- a/src/Error.h
+++ b/src/Error.h
@@ -191,6 +191,7 @@ namespace ts {
             group_invalid_id = 0x1300,
             group_name_inuse = 0x1301,
             group_not_assigned_over_this_server = 0x1302,
+            group_not_empty = 0x1303,
 
             conversation_invalid_id = 0x2200,
             conversation_more_data = 0x2201,