Error message

• Notice: Undefined index: und in at_codex_file_link() (line 127 of /home/sites/romerotrust.org.uk/public_html/drupal/sites/all/themes/at_codex/template.php).
• Warning: Invalid argument supplied for foreach() in at_codex_file_link() (line 127 of /home/sites/romerotrust.org.uk/public_html/drupal/sites/all/themes/at_codex/template.php).