i have installed sqlsession product and only change sqlSessionCreate as insert into sessions ( session ) values ( nextval('sessions_session_seq') :: varchar ) i have tried code block from How-To: Using SQLSession. everything seems to work except <dtml-call "SESSION.clear()">. traceback: Traceback (innermost last): File /home3/local/src/Zope-2.1.5-src/lib/python/ZPublisher/Publish.py, line 214, in publish_module File /home3/local/src/Zope-2.1.5-src/lib/python/ZPublisher/Publish.py, line 179, in publish File /home3/local/src/Zope-2.1.5-src/lib/python/Zope/__init__.py, line 202, in zpublisher_exception_hook (Object: ElementWithAttributes) File /home3/local/src/Zope-2.1.5-src/lib/python/ZPublisher/Publish.py, line 165, in publish File /home3/local/src/Zope-2.1.5-src/lib/python/ZPublisher/mapply.py, line 160, in mapply (Object: sessiontest) File /home3/local/src/Zope-2.1.5-src/lib/python/ZPublisher/Publish.py, line 102, in call_object (Object: sessiontest) File /home3/local/src/Zope-2.1.5-src/lib/python/OFS/DTMLMethod.py, line 150, in __call__ (Object: sessiontest) File /home3/local/src/Zope-2.1.5-src/lib/python/DocumentTemplate/DT_String.py, line 502, in __call__ (Object: sessiontest) File /home3/local/src/Zope-2.1.5-src/lib/python/DocumentTemplate/DT_Util.py, line 335, in eval (Object: SESSION.clear()) (Info: SESSION) File <string>, line 0, in ? File /usr/local/src/Zope-2.1.6-src/lib/python/Products/SQLSession/SQLSession.py , line 172, in clear File /home3/local/src/Zope-2.1.6-src/lib/python/Shared/DC/ZRDB/DA.py, line 408, in __call__ (Object: sqlDeleteValue) File /home3/local/src/Zope-2.1.5-src/lib/python/Shared/DC/ZRDB/Aqueduct.py, line 186, in _argdata (Object: sqlDeleteValue) Bad Request: (see above) -- 'Life is like boxes of chocolate, Forrest. You never know what you're gonna get.' -- Forrest Gump (1994) Lo Chung-Chang (shortie) shortie@ms14.hinet.net http://shortie.vbc.com.tw/ ICQ#27118251 Kaohsiung.Taiwan.Roc.Earth.Solar.Galaxy.Universe