Error when using Contributions by author
Firefox 3.6.13
TikiWiki 6.1
When i try to view Contributions by author on a wiki page on my wiki site, i get the following error:
Fatal error: Call to undefined function mb_strlen() in .../lib/wiki/histlib.php on line 689
This is displayed on a plain white page.
in histlib.php, line 689 is this:
$l=mb_strlen($w);
Anyone have any insight into why it is doing this?
Thanks all.