This means that you don't have the Perl module named 'LWP::Protocol::http' installed, and the script is not able to make HTTPS requests because of that. If you're using CentOS, you can install it by simply typing 'yum install perl-Crypt-SSLeay' from root SSH console. If you're not using CentOS, or this method isn't applicable for some reasons, please refer to your OS manual or contact your hoster's support in order for that to be resolved.
By the way, 'LWP::Protocol::http' is listed as a mandatory dependency in INSTALL.txt which comes with XFileSharingPro distribution. We're highly suggesting you to open this file in your text editor and make sure that you have the rest of dependency modules installed, as otherwise you will get more problems with the script.