Error message

• Notice: Use of undefined constant MENU_PREFERRED_LINK - assumed 'MENU_PREFERRED_LINK' in i18n_menu_init() (line 811 of /home/rlaitano/public_html/sites/all/modules/i18n/i18n_menu/i18n_menu.module).
• Notice: Use of undefined constant MENU_PREFERRED_LINK - assumed 'MENU_PREFERRED_LINK' in i18n_menu_init() (line 849 of /home/rlaitano/public_html/sites/all/modules/i18n/i18n_menu/i18n_menu.module).
• Notice: Use of undefined constant MENU_PREFERRED_LINK - assumed 'MENU_PREFERRED_LINK' in i18n_menu_init() (line 851 of /home/rlaitano/public_html/sites/all/modules/i18n/i18n_menu/i18n_menu.module).
• Notice: Use of undefined constant MENU_PREFERRED_LINK - assumed 'MENU_PREFERRED_LINK' in i18n_menu_init() (line 849 of /home/rlaitano/public_html/sites/all/modules/i18n/i18n_menu/i18n_menu.module).