Error when searching and under other circumstances

I recieve the following error below the search results after i send of a search our site under development at www.torturecare.org.uk/new :

warning: array_map(): The first argument, 'utf8_encode', should be either NULL or a valid callback in /var/www/localhost/htdocs/temp/php/torture/new/includes/unicode.inc on line 284.

I also got the same error when using a html for a link in a textarea that was used in the contact module >> settings >> 'Additional information:' field.

Anyone have any ideas? Most recent version 4.7.2