Error on Jobs & Experts pages

Getting errors on an Expert page Im building in a dev site:

One: the Job & Experts icons are missing at the top of the page, and the font is different.

Two: at bottom of page, we've got:

Fatal error: Call to undefined function mb_convert_encoding() in /home/hauman/public_html/mix/wp-content/plugins/jobs-plus/vendors/SmartDOMDocument.class.php on line 36

Any thoughts? Thanks in advance.