GUI - Inbound Routes : White page

I have migrated our Asterisk from old hardware server to the new with
VMware. I have made a backup and restore it to the new fresh
installation, everything worked perfectly without problems. But I
updated the sysadmin module and then I wanted to check the “Inbound
Routes” and it appear as a white blank page O_O. But I do not know if
this has something to do with the backup-restore transfer or with the
update of the module sysadmin. I have track the error so far :

#tail -f /var/log/httpd/error_log

[Fri Aug 28 08:45:45 2015] [error] [client 192.168.50.81] PHP Fatal error:  
Class 'FreePBX' not found in /var/www/html/admin/modules/cos/Cos.class.php on line 0,
referer: http://192.168.40.12/admin/config.php?display=index

I am not sure if the php version were different on the old one, the
current is 5.3
The thing is, everything works in the GUI but when I went for the
Inbound Routes I see that page, otherwise the routes and configuration
of the asterisk work as it should.

Asterisk (Ver. 11.16.0)
P.S. The old server might be x32 the new is x64 , here is an output of the asterisk.conf:

nano /etc/asterisk/asterisk.conf

[directories]
astetcdir => /etc/asterisk
astmoddir => /usr/lib64/asterisk/modules
astvarlibdir => /var/lib/asterisk
astagidir => /var/lib/asterisk/agi-bin
astspooldir => /var/spool/asterisk
astrundir => /var/run/asterisk
astlogdir => /var/log/asterisk

[options]
transmit_silence_during_record = yes
languageprefix=yes
execincludes=yes