I just started to experiment with catalogs and indexes. I have created a test folder, converted it into a site and added a catalog. Then I have tried to add an index, but get the following error:

ComponentLookupError: (<InterfaceClass zope.app.intid.interfaces.IIntIds>, '')

After that, I was not able to delete the catalog. I had to delete my Data.fs and start from scratch. I tought that a catalog might require a registered IIntIds provider, so I repeated the steps above, but I created a "Unique Id Utility" before I created the catalog. But I still get the same error.

Documentation for catalog and index is quite short and looks not very complicated. But didn't see a reference to IIntIds!?

What am I doing wrong?

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