Error Message After Upgrade to 3.3.4

I get the following message on every administrator page after upgrading to 3.3.4:

Warning: include_once(simple-icons.php): failed to open stream: No such file or directory in /wp-content/plugins/indieweb/includes/class-hcard-user.php on line 12

Warning: include_once(): Failed opening 'simple-icons.php' for inclusion (include_path='.:/usr/local/lib/php:/usr/local/php5/lib/pear') in /wp-content/plugins/indieweb/includes/class-hcard-user.php on line 12

Warning: Cannot modify header information - headers already sent by (output started at /wp-content/plugins/indieweb/includes/class-hcard-user.php:12) in /home/kamss711heb/davidpace.com/wp-admin/includes/misc.php on line 1114