Support » Fixing WordPress » Unable to assign categories

  • In the past I have been able to assign categories to posts but for no apparent reason, the following message appears in the category window on the editing page:
    Warning: call_user_func() [function.call-user-func]: First argument is expected to be a valid callback in /websites/123reg/LinuxPackage21/wh/at/gr/whatgrabsyou.co.uk/public_html/wordpress/wp-admin/includes/template.php on line 924

    I am a non-technical silver surfer, keen to keep my little site going, so would appreciate any simple to understand advice.
    My site is http://www.whatgrabsyou.co.uk

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