Hi, Can somebody explain me how you can use the given tracebacks to find the possible error? For example, I get the following error and I know what causes it, but I don't know where I must go to find the code-line where the error starts: I get the following error when I use a table in which a field is defined with a default string value. eg : MY_NAME CHAR(20) DEFAULT 'tom' MY_DATE TIMESTAMP DEFAULT '6/07/2000' MY_DATE TIMESTAMP DEFAULT 'NOW' --- Zope Error Zope has encountered an error while publishing this resource. Error Type: cPickle.PicklingError Error Value: Cannot pickle objects. --- <!-- Traceback (innermost last): File /usr/local/zope/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /usr/local/zope/lib/python/ZPublisher/Publish.py, line 187, in publish File /usr/local/zope/lib/python/Zope/__init__.py, line 221, in zpublisher_exception_hook File /usr/local/zope/lib/python/ZPublisher/Publish.py, line 175, in publish File /usr/local/zope/lib/python/Zope/__init__.py, line 235, in commit File /usr/local/zope/lib/python/ZODB/Transaction.py, line 251, in commit File /usr/local/zope/lib/python/ZODB/Connection.py, line 348, in commit (Info: (('Products.ZnolkSQLWizard.Wizard', 'ZnolkSQLWizard'), '\000\000\000\000\000\000\015\025', '')) cPickle.PicklingError: (see above) --> Thanks for any advice. Tom