elFinder - FTP Class File Missing / Error -

so downloaded library http://elfinder.org/ (v.2.0-rc1) , missing ftp class file.

i tried downloading library directly github , got different version reason (v2.x). when copy ftp class file on there (or try using entire build), error anytime try include file in connector.php file:

"unable connect backend."

(yes, have correct ftp info entered connector.php file. error generated whenever attempt include ftp class file. if don't include it, can access local files fine.)

where correct file or doing wrong?

you must include php files in connector.php , ftp class too