504 Command not implemented for that parameter

[21:50:50] SITE CHMOD 777 config.php
[21:50:50] 504 Command not implemented for that parameter

The 504 error is not mentioned in the Knowledge Base. Does "not implemented" mean that the CHMOD function does not work? I have an unlicensed version. Or is there some setting I can change?

SITE CHMOD is not supported by your FTP server. Contact the adminstrator of your FTP server.

Regards,
-Mat