Fatal Error by activacion plugin Ceceppa

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /data/web/virtuals/166360/virtual/www/wp-content/plugins/ceceppa-multilingua/admin/admin-backup-fn.php:12 Stack trace: #0 /data/web/virtuals/166360/virtual/www/wp-content/plugins/ceceppa-multilingua/admin/admin-backup-fn.php(121): _cml_backup_tables(‘*’, ”) #1 /data/web/virtuals/166360/virtual/www/wp-content/plugins/ceceppa-multilingua/admin/install.php(218): _cml_backup_do_tables(‘DB’, ‘/data/web/virtu…’) #2 /data/web/virtuals/166360/virtual/www/wp-content/plugins/ceceppa-multilingua/ceceppaml.php(252): cml_do_install() #3 /data/web/virtuals/166360/virtual/www/wp-includes/class-wp-hook.php(288): CeceppaML->activated(”) #4 /data/web/virtuals/166360/virtual/www/wp-includes/class-wp-hook.php(312): WP_Hook->apply_filters(”, Array) #5 /data/web/virtuals/166360/virtual/www/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #6 /data/web/virtuals/166360/virtual/www/wp-admin/plugins.php(177): do_action(‘activate_cecepp…’) #7 {main} thrown in /data/web/virtuals/166360/virtual/www/wp-content/plugins/ceceppa-multilingua/admin/admin-backup-fn.php on line 12