I am not a techie but here's some data from the log file:
17:19:08 [DEBUG] (AudioPlayerUiController:106) - Player stop status.
17:19:11 [DEBUG] (AudioPlayerUiController:106) - Play/pause status changed to true. Current status is -1.
17:19:12 [DEBUG] (AudioPlayerUiController:106) - Open playable object: NamedBufferedInputStream[
http://everyayah.com/data/Ghamadi_40kbps/042003.mp3].
17:19:12 [ERROR] (AudioPlayerUiController:122) - Error occured in play-pause method.
net.sf.zekr.engine.audio.PlayerException: Error opening playable object: NamedBufferedInputStream[
http://everyayah.com/data/Ghamadi_40kbps/042003.mp3]
at net.sf.zekr.engine.audio.DefaultPlayerController.open(DefaultPlayerController.java:139)
at net.sf.zekr.engine.audio.DefaultPlayerController.open(DefaultPlayerController.java:145)
at net.sf.zekr.ui.AudioPlayerUiController.playerOpenAyaAudio(AudioPlayerUiController.java:249)
at net.sf.zekr.ui.AudioPlayerUiController.playerOpenAyaAudio(AudioPlayerUiController.java:244)
at net.sf.zekr.ui.AudioPlayerUiController.playerTogglePlayPause(AudioPlayerUiController.java:215)
at net.sf.zekr.engine.audio.ui.AudioPlayerForm$13.widgetSelected(AudioPlayerForm.java:719)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:240)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1258)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3588)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3209)
at net.sf.zekr.ui.BaseForm.loopEver(BaseForm.java:36)
at net.sf.zekr.ZekrMain.startZekr(ZekrMain.java:63)
at net.sf.zekr.ZekrMain.main(ZekrMain.java:94)
Caused by: javazoom.jlgui.basicplayer.BasicPlayerException: javax.sound.sampled.UnsupportedAudioFileException: could not get audio input stream from input stream
at javazoom.jlgui.basicplayer.BasicPlayer.initAudioInputStream(Unknown Source)
at javazoom.jlgui.basicplayer.BasicPlayer.open(Unknown Source)
at net.sf.zekr.engine.audio.DefaultPlayerController.open(DefaultPlayerController.java:133)
... 13 more
Caused by: javax.sound.sampled.UnsupportedAudioFileException: could not get audio input stream from input stream
at javax.sound.sampled.AudioSystem.getAudioInputStream(AudioSystem.java:1119)
at javazoom.jlgui.basicplayer.BasicPlayer.initAudioInputStream(Unknown Source)
... 16 more
17:19:12 [DEBUG] (AudioPlayerUiController:106) - Player stop status.
17:19:24 [DEBUG] (AboutForm:106) - Open log file: /home/rafiq/.zekr/zekr.log