error VMFILE Virtuemart

hi all
i install my store tempalte and on admin page see it warning:

Warning, the Safe Path is empty, for safety reasons it is very important to create a folder in a path not accessible by an URL, create also a folder invoices in it to store your sensible data secure. Our suggested path is for your system C:\xampp\xampp\htdocs\vmfiles

what is this?
thanks

ANY RESPONSE???
I FIND SOLUTION:

on virtuemart back end is necessary to complete this row:
SAFE INVOICES

BECAUSE it is safe for vendor.
see my attach

hi all
i install my store tempalte and on admin page see it warning:

Warning, the Safe Path is empty, for safety reasons it is very important to create a folder in a path not accessible by an URL, create also a folder invoices in it to store your sensible data secure. Our suggested path is for your system C:\xampp\xampp\htdocs\vmfiles

what is this?
thanks