Fatal error when activating plugin

Hello,

I have just installed the plugin on my blog and whenever I activate it this error appears:

Warning: require_once(/home/whyamisi/public_html/wp-content/plugins/anspress-question-answer/theme/whis/functions.php): failed to open stream: No such file or directory in /home/whyamisi/public_html/wp-content/plugins/anspress-question-answer/includes/class-theme.php on line 51

 Fatal error: require_once(): Failed opening required ‘/home/whyamisi/public_html/wp-content/plugins/anspress-question-answer/theme/whis/functions.php’ (include_path=’.:/usr/local/php55/pear’) in /home/whyamisi/public_html/wp-content/plugins/anspress-question-answer/includes/class-theme.php on line 51

Any help?

Cheers, Mena