ERROR ! stream_ns.play video name????

[yunakokimama]

var connection_nc:NetConnection = new NetConnection();
connection_nc.connect(null);
var stream_ns:NetStream = new NetStream(connection_nc);
my_video.attachVideo(stream_ns);
stream_ns.play("http://www.helpexamples.com/flash/video/typing_short.flv");

I replaced video name to my_video.flv. I created my_video.flv and save in WEB folder.

But it doesn't work, I tried many times, but it didn;t work at all. Please HEEEELP me!!!

[cancerinform]

Where did you test all flvs?