Upgrade FreePbx Server and Fix Error Unable BMO Class

1) fix issue "Unable to locate the FreePBX BMO Class 'Core’A required module might be disabled or uninstalled" 2) I can't see extensions (it seems is due to previous error) 3) update all modules. 4) clean temporary big files (space now is reaching limit) 5) make backup of all system (schedule) 6) show all mp3 logs from web application. 7) after I restart server , I have to down firewall to access web interface (add my office ip to a white list) important : freepbx is working fine, avoid to damage , all must be working after make upgrade or fix issue. "error to fix" exit: 1 Unable to continue. No se puede localizar la Clase FreePBX BMO 'Core'Un módulo requerido puede estar deshabilitado o desinstalado. Pasos recomendados (ejecutar desde la CLI): 1) fwconsole ma install core 2) fwconsole ma enable core in /var/www/html/admin/libraries/BMO/[login to view URL] on line 213 #0 /var/www/html/admin/libraries/BMO/[login to view URL](106): FreePBX\Self_Helper->loadObject('Core') #1 /var/www/html/admin/libraries/BMO/[login to view URL](37): FreePBX\Self_Helper->autoLoad('Core') #2 /var/www/html/admin/modules/certman/[login to view URL](39): FreePBX\Self_Helper->__get('Core') #3 /var/www/html/admin/libraries/BMO/[login to view URL](124): FreePBX\modules\Certman->__construct(Object(FreePBX)) #4 /var/www/html/admin/libraries/BMO/[login to view URL](37): FreePBX\Self_Helper->autoLoad('Certman') #5 /var/www/html/admin/libraries/BMO/[login to view URL](298): FreePBX\Self_Helper->__get('Certman') #6 /var/www/html/admin/libraries/BMO/[login to view URL](39): FreePBX\Hooks->preloadBMOModules() #7 /var/lib/asterisk/bin/retrieve_conf(81): FreePBX\Hooks->updateBMOHooks() #8 {main}