sftp, ftp mget get

i installed vsftpd on my machine running ubuntu 11.04 and i try access on a variety of different computers including my laptop with ubuntu 11.04 on it. Well i downloaded my music folder from the server using mget and using a wild card *.mp3, but when i try to use get to download a single file and i type the files name in or copy and paste the files name in i get the error 550 failed to open file. I try using the passive command but i dont think my firewall is the problem considering i can use mget. I am running this on a lan. so can anyone explain to me how to fix this is it would be much appreciated.

URL: