install error

hi.
I tried install “Fundingpress” at different server
but,this time is install error.
message is

Warning: require_once(System.php): failed to open stream: No such file or directory in /home/ifund/ifund.co.jp/public_html/wp-content/themes/funding_press/funding/lib/PayPal/Serializer/Serializer.php on line 54

Fatal error: require_once(): Failed opening required ‘System.php’ (include_path=’.’) in /home/ifund/ifund.co.jp/public_html/wp-content/themes/funding_press/funding/lib/PayPal/Serializer/Serializer.php on line 54

please fix it for me!
where do I have to change??