iphone app cannot stream but winamp does

[arti]

Hi!
We are streaming from our radio website www.radioiranonair.com We are streming pls files that can be listened to by winamp, WMP etc.. and until a couple of weeks ago the iphone app used to work too. But nowadays it says "cannot find URL". If I seek the station in Shoutcast it exists.. and if I listen to it from a browser it works... and even trying other apps such as streamitall it works but not shoutcast app...

any ideas???

thanks in advance!
br
Arti