Adding a reference_catalog to the site

How would I add a reference_catalog to a plone site via the ZMI? When I
visit the main page of a site that I migrated, I get the following error
when viewing any content:

Error Type 
        AttributeError
Error Value 
        reference_catalog
Request made at 
        2006/08/31 16:16:19.108 GMT-5

Thanks for any advice.

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