Fix issues with C backend with new error message hierarchy
diff --git a/of_g.py b/of_g.py
index 651ee64..d63689f 100644
--- a/of_g.py
+++ b/of_g.py
@@ -174,7 +174,7 @@
 
 ## These members do not get normal accessors
 
-skip_members = ["version", "type", "length", "stats_type", "len",
+skip_members = ["version", "type", "length", "err_type", "stats_type", "len",
                 "type_len", "actions_len", "_command"]
 
 ## Some OpenFlow string length constants