Great !!!
after correctly download the sysadmin module by the command
[root@freepbx~]# amportal a ma download sysadmin
Fetching FreePBX settings with gen_amp_conf.php..
Downloading 305255 of 305255 (100%)
Untaring..Done
Module sysadmin successfully downloaded
SETTING FILE PERMISSIONS...................Done
Removing any dangling symlinks
Dangling symlinks removed
[root@freepbx~]#
I’ve perform an upgrade and enabling procedure in the Module Admin Page
Please wait while module actions are performed
Installing sysadmin
checking for ftp_server field..already exists
checking for tftp_server field..already exists
checking for ups_enabled field..already exists
Generating CSS...Done
sysadmin installed successfully
everything is all right now
Thank you very much