Function create_function() is deprecated error

Deprecated: Function create_function() is deprecated in /home/lifeisok/public_html/pythonstation.com/wp-content/plugins/codecolorer/lib/geshi.php on line 4698

Could you please help me out with this? I tried opening the file mentioned in this location and it seems that we are indeed calling a “create_function” in this plugin. It would be great if you could help me fix this issue because this will get shown to whoever comes across this page and will give a false impression about the quality of the site.

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