Since the collector is down I post it here zope 2.3.3, 2.4 If branches and branches_expr is given, the tree tag should raise a parse error, in TreeTag.py: 134 raise ParseError, _tm( 135 'branches and and branches_expr given', 'tree') But _tm seems not to exist anymore, so zope raises a NameError, ErrorValue: _tm. Perhaps _tm is a remnant of older zope releases and doesn't exist anymore? I didn't find it defined anywhere. Quick greping reveals that _tm is also used in MIMETag.py. cheers, ol