Warning: usort() [function.usort]

  • I get this message every time I try to save or update my site. How can I get rid of this?

    Warning: usort() [function.usort]: Array was modified by the user comparison function in /home/content/17/6767117/html/wp-admin/includes/menu.php on line 299

    Warning: Cannot modify header information – headers already sent by (output started at /home/content/17/6767117/html/wp-admin/includes/menu.php:299) in /home/content/17/6767117/html/wp-includes/pluggable.php on line 1178

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