Unknown column 'TreeRight' in 'field list'

edited April 2011 in Vanilla 2.0 - 2.8
Hi.
When I answer to the post I take error:
Unknown column 'TreeRight' in 'field list'|Gdn_Database|Query|select max(TreeRight) as `MaxRight` from GDN_Comment Comment where DiscussionID = :DiscussionID

How can I fix it?
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