Call to undefined function drupal_add_html_head

Im upgrading from 6 to 7. I followed the instructions found here: https://www.drupal.org/node/570162. When I get to step 13 Run the update script i get the following error:

Fatal error: Call to undefined function drupal_add_html_head() in /var/www/clarityraoupgrade/includes/install.core.inc on line 713

Any ideas what to do?

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/21/feed

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