In quale cartella o file devo mettere i permessi?

Nel FTP mi segna questa frase:
550 com_zoom: Operation not permitted
(cosa significa???)
in particolare queste cose :

257 "/httpdocs/demo/ugolini/administrator/components" is current directory.
SITE CHMOD 777 com_zoom
550 com_zoom: Operation not permitted
CWD /httpdocs/demo/ugolini/administrator/components/com_zoom