Question / Help Problems starting stream

[nnmefreghi]

Hi,
first of all sorry for my bad english.
Yesterday I downloaded this software in order to stream some my games but I'm having a problem. The preview of my stream is ok, but if I start it after 3 seconds I have this message:
rtmp://live-dfw.justin.tv/app:
NetStream.Publish.Rejected (Authentication Failed.)" .

How can I resolve? Surfing on the internet I found a lot of people with my same problem but I can't find a solution.
Can you help me?

Thank you!

 

[Krazy]

Did you put your stream key into the right section under Broadcast settings? Log in to Twitch and go to this site to grab it: www.twitch.tv/broadcast

Protip: copy the key to notepad or something first to make sure no extra spaces get added, which will cause your key to be invalid