Hello,
It is not error, it just notice.
Go to System - Global Configuration - Server - Server Settings and put Error Reporting - System default.
If this will not help Give us please - link on site, FTP and admin access and we will try to help you, FTP and admin access You can send to our contact form.
ordasoft.com/About-us/OrdaSoft.html
Joomla Admin
username
password
FTP
FTP host
FTP username
FTP password
Thanks,
OrdaSoft team.
Best Regards,
Taras
OrdaSoft team