I usually saw this error when some of the objects persisted in the ZODB have references to (i.e. they directly provide) interfaces that are not there in the code anymore anymore, such as when an interface class is removed or moved to another module or package. It can be solved by providing the old interface in the same place in the 'module/package' namespace. Or by removing the interface reference from the object in the old environment before starting the code in the new environment. Incidentally, I'm of the opinion that these kinds of errors should be captured by either zope.interface or by ZODB, logged as 'ERROR', and the object returned without the faulty interface, but that seems to require either adding knowledge about zope.interface to ZODB or vice-versa. Cheers, On Wed, Mar 2, 2011 at 12:07, robert rottermann <robert@redcor.ch> wrote:

Hi there, I created a 4.1a3 buildout and added all needed products, of which I had to adapt some to be able to start at all. Then I copied the data.fs of a 3.5x site.

Now in the ZMI, when I want to navigate to the plone 3.5 folder I get the following error:

What can I do to fix that? Do I have to prepare the Data.fs somehow?

thanks robert

2011-03-02 11:57:55 ERROR Zope.SiteErrorLog 1299063475.730.425785426825 http://localhost:8481/focus/focus Traceback (innermost last):   Module ZPublisher.Publish, line 115, in publish   Module ZPublisher.BaseRequest, line 437, in traverse   Module ZPublisher.BeforeTraverse, line 97, in __call__   Module Products.CMFCore.PortalObject, line 78, in __before_publishing_traverse__   Module zope.event, line 23, in notify   Module zope.component.event, line 24, in dispatch   Module zope.component._api, line 136, in subscribers   Module zope.component.registry, line 321, in subscribers   Module zope.interface.adapter, line 585, in subscribers   Module zope.component.event, line 32, in objectEventNotify   Module zope.component._api, line 136, in subscribers   Module zope.component.registry, line 321, in subscribers   Module zope.interface.adapter, line 585, in subscribers   Module plone.browserlayer.layer, line 14, in mark_layer   Module zope.component._api, line 179, in getAllUtilitiesRegisteredFor   Module zope.component.registry, line 176, in getAllUtilitiesRegisteredFor   Module ZODB.Connection, line 859, in setstate   Module ZODB.Connection, line 913, in _setstate   Module ZODB.serialize, line 613, in setGhostState   Module zope.component.persistentregistry, line 40, in __setstate__   Module zope.interface.adapter, line 91, in _createLookup   Module zope.interface.adapter, line 439, in __init__   Module zope.interface.adapter, line 476, in init_extendors   Module zope.interface.adapter, line 480, in add_extendor AttributeError: type object 'IDatabaseSettings' has no attribute '__iro__' 2011-03-02 11:57:55 WARNING OFS.Uninstalled Could not import class 'IThemeSpecific' from module 'focus.theme.browser.interfaces' 2011-03-02 11:57:55 WARNING OFS.Uninstalled Could not import class 'IFocViewletManager' from module 'focus.theme.browser.interfaces' 2011-03-02 11:57:55 ERROR ZODB.Connection Couldn't load state for 0x19746b Traceback (most recent call last):   File "/home/zope/focus4/eggs/ZODB3-3.10.1-py2.6-linux-i686.egg/ZODB/Connection.py", line 859, in setstate     self._setstate(obj)   File "/home/zope/focus4/eggs/ZODB3-3.10.1-py2.6-linux-i686.egg/ZODB/Connection.py", line 913, in _setstate     self._reader.setGhostState(obj, p)   File "/home/zope/focus4/eggs/ZODB3-3.10.1-py2.6-linux-i686.egg/ZODB/serialize.py", line 613, in setGhostState     obj.__setstate__(state)   File "/home/zope/focus4/eggs/zope.component-3.10.0-py2.6.egg/zope/component/persistentregistry.py", line 40, in __setstate__     self._createLookup()   File "/home/zope/focus4/eggs/zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/adapter.py", line 91, in _createLookup     self._v_lookup = self.LookupClass(self)   File "/home/zope/focus4/eggs/zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/adapter.py", line 439, in __init__     self.init_extendors()   File "/home/zope/focus4/eggs/zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/adapter.py", line 476, in init_extendors     self.add_extendor(p)   File "/home/zope/focus4/eggs/zope.interface-3.6.1-py2.6-linux-i686.egg/zope/interface/adapter.py", line 480, in add_extendor     for i in provided.__iro__: AttributeError: type object 'IDatabaseSettings' has no attribute '__iro__'