[Zope] DocumentLibrary on Zope 2.6

Hi, I have been trying to add a DocumentLibrary (the Kaivo product) into a Zope site, but get the error message below. This is the first time I've tried using the product. It installed with no problems. However, I am using Zope 2.6.0 - so perhaps the problem has something to do with the improvements made to ZCatalog(??) Is there a way around this problem? I couldn't find any references to this problem in the maillist archives - so I presume others have managed to install and get this product working in Zope 2.6. Sorry, an error occured: * Page: http://....../manage_addProduct/DocumentLibrary/manage_addDocumentLibrary * Error type: AttributeError * Error value: lexicon Thanks for your suggestions. Regards, Erik Isokangas