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Sidebar.php Fatal Error

  • Hi,
    After attempting to add Adsense to the sidebar.php I received the following error:

    Fatal error: Call to undefined function: wp_list_categories() in /home/search/public_html/blog/wordpress/wp-content/themes/default/sidebar.php on line 54

    I then attempted to correct sidebar.php by removing the adsense code but the error remains. I also replaced sidebar.php with a copy from the download file but the error remains.
    All help would be appreciated. Thank you.

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