Found a debug file that has this message. Can someone translate what it means??

[13-Oct-2011 20:53:45] PHP Fatal error: Call to undefined function zen_generate_category_path() in /home/herbschi/public_html/sourceforherbs.com/includes/classes/google_base.php on line 233

The message above ties into the following prior posting.
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Working on a site and have upgraded to latest Google Merchant Center feeder. I've reinstalled the latest sql files without a problem. Have no errors of any kind.
Actual website is functioning normally.

Ran the feed and the Confirm shows the following:
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Google Merchant Center Feeder v1.10.2 started 2011/10/13 10:07:14
Feed file - /home/herbschi/public_html/sourceforherbs.com/feed/sourceforherbs_products_en.xml
Processing: Feed - Yes, Upload - No
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Where are my products??

Zen 1.3.7
Google feeder 1.10.2
sql 1.10.2
Numinix product feed