Website Error

I am getting these errors every time I open my website. Started happening as soon as I updated. Please Help. Thanks

Warning: require(/home/content/87/7971987/html/wp-content/plugins/extended-categories-widget/avh-ec.client.php) [function.require]: failed to open stream: No such file or directory in /home/content/87/7971987/html/wp-content/plugins/extended-categories-widget/widget_extended_categories.php on line 64

Fatal error: require() [function.require]: Failed opening required ‘/home/content/87/7971987/html/wp-content/plugins/extended-categories-widget/avh-ec.client.php’ (include_path=’.:/usr/local/php5/lib/php’) in /home/content/87/7971987/html/wp-content/plugins/extended-categories-widget/widget_extended_categories.php on line 64