Can't get it to work

[MiSiL]

I've followed the INSTALL.TXT and put the php-pack into the system dir. I've added the lines to ioftpd.ini and to ioftpd.env But still the script won't run. When something is uploaded nothing happens, and when i try "SITE RESCAN" it sais:
[R] 500 SITE rescan: Command not understood. It's like the script ain't even loaded :S

Please help me, thanks in advance!