KPlayer can't play streaming video.

Hi all.
I’m trying to play inet streaming video using KPlayer, I don’t know what’s the prob but it says:

Couldn’t resolve name for AF_INET:
Couldn’t resolve name for AF_INET6:
No stream found to handle url
Resolving for AF_INET…
Resolving for AF_INET6…
Exiting… (End of file)

Tried “prefer-ipv4 = yes” option in mplayer config but it didn’t help.

Any ideas people?