Error accessing Admin Page

I updated wordpress today. Now everytime I try to go back to my admin page (wp-admin) I get the following errors:

Warning: require_once(/home/content/a/l/c/alcarr/html/wp-content/plugins/constant-contact-api/admin/contacts.php) [function.require-once]: failed to open stream: No such file or directory in/home/content/a/l/c/alcarr/html/wp-content/plugins/constant-contact-api/constant-contact-api.php on line 41

Fatal error: require_once() [function.require]: Failed opening required ‘/home/content/a/l/c/alcarr/html/wp-content/plugins/constant-contact-api/admin/contacts.php’ (include_path=’.:/usr/local/php5/lib/php’) in/home/content/a/l/c/alcarr/html/wp-content/plugins/constant-contact-api/constant-contact-api.php on line 41

Has anyone seen these errors and have a solution for me?

Thanks