Elastix config page in white. pleace help!

hi, i am having issues (totally white screen) whith my elastix config web after running the update of elastix. Did Anyone knows if i have to do changes to acces after the update. current version freepbx_ha (current:

error log :

[Thu Jan 12 13:59:12 2017] [error] [client x] PHP Warning: require_once(/var/www/html/admin/libraries/utility.functions.php) [function.require-once]: failed to open stream: No such file or directory in /var/www/html/admin/bootstrap.php on line 69

[Thu Jan 12 13:59:12 2017] [error] [client x] PHP Fatal error: require_once() [function.require]: Failed opening required ‘/var/www/html/admin/libraries/utility.functions.php’ (include_path=’/var/www/html/modules/pbxadmin/libs:/var/www/html/libs:.:/usr/share/pear:/usr/share/php’) in /var/www/html/admin/bootstrap.php on line 69

the filer (utility.functions.php) NOT exist

Have you tried migrating your Elastix box to FreePBX?