error in pubsub

I upgrade ejabberd from 2.05 to 2.1.8
erlang-r12b5

Everything works, but when someone logs in, then I see In ejabberd.log

=ERROR REPORT==== 2011-09-04 17:36:16 ===
Error in process <0.399.0> on node 'ejabberd@rtr' with exit value: {badarg,[{erlang,binary_to_list,["http://jabber.org/protocol/mood"]},{mod_pubsub,send_items,6},{lists,foreach,2}]}

What does this error mean?

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