RVM Global Settings callback warning

Hi,

Just transferred my site to a new host yesterday and trying to iron out all the new issues. Now noticed this warning in my WP dashboard for RVM global settings. How can I fix this?

Many thanks

Warning: call_user_func() expects parameter 1 to be a valid callback, function ‘rvm_section_main’ not found or invalid function name in /home/nillas5/public_html/wp-admin/includes/template.php on line 1484

The page I need help with: [log in to see the link]