I keep getting this error message this morning in admin

Hi Guys,

I keep getting this error message this morning in admin

Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'ot_register_theme_options_page' was given in /home/pigeon1/public_html/wp-includes/plugin.php on line 406
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Warning: call_user_func_array() [function.call-user-func-array]: First argument is expected to be a valid callback, 'ot_register_theme_options_admin_bar_menu' was given in /home/pigeon1/public_html/wp-includes/plugin.php on line 487

Any ideas?

Cheers
Ian