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-rw-r--r--slixmpp/stanza/error.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/slixmpp/stanza/error.py b/slixmpp/stanza/error.py
index 67f736c0..1499c652 100644
--- a/slixmpp/stanza/error.py
+++ b/slixmpp/stanza/error.py
@@ -53,7 +53,7 @@ class Error(ElementBase):
plugin_attrib = 'error'
interfaces = set(('code', 'condition', 'text', 'type',
'gone', 'redirect', 'by'))
- sub_interfaces = set(('text',))
+ sub_interfaces = {'text'}
plugin_attrib_map = {}
plugin_tag_map = {}
conditions = set(('bad-request', 'conflict', 'feature-not-implemented',