Fatal Error with Updraftplus

Hi I’m getting the following two error messages when I try to access my site, and I can’t get in to edit or update my webpage. I have no idea how to get my site up and running again. Disaster! Can anybody help? Thanks.

Warning: require_once(/home/a4227964/public_html/wp-content/plugins/updraftplus/options.php) [function.require-once]: failed to open stream: No such file or directory in /home/a4227964/public_html/wp-content/plugins/updraftplus/updraftplus.php on line 123

Fatal error: require_once() [function.require]: Failed opening required ‘/home/a4227964/public_html/wp-content/plugins/updraftplus/options.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/a4227964/public_html/wp-content/plugins/updraftplus/updraftplus.php on line 123