Fatal error after upgrading to release 1.2.20

After upgrading to the latest realese under “My translations” and “Site Title/tagline” I get this error message:

Warning: require_once(mo-convert.php) [function.require-once]: failed to open stream: No such file or directory in /home/content/62/10799762/html/wp-content/plugins/ceceppa-multilingua/includes/translations.php on line 6

Fatal error: require_once() [function.require]: Failed opening required 'mo-convert.php' (include_path='.:/usr/local/php5_3/lib/php') in /home/content/62/10799762/html/wp-content/plugins/ceceppa-multilingua/includes/translations.php on line 6

http://wordpress.org/plugins/ceceppa-multilingua/