"URL Not Supported"

What does "URL Not Supported" mean?

My web hosting company (Webmage) gave me two urls to use for uploading files. One is in the format: http://www.mysite.com, the other is in the format: http://mysite.webmage.com. Once the userid and password are entered and I try to connect I get a popup window that says "URL Not Supported."

Does Smartftp not support a URL format like these two? What else might be the problem?

Thanks.

You can't use smartftp to upload using http protocol.

just drop the http:// should solve that
use www.mysite.com alone