Check the links, and other options and aslo This wil be shown when your player file has sth wrong with it.
make sure that in script you have enter the correct address :
Code:
<script type='text/javascript' src='forum/swplayers/flash/swfobject.js'></script>
<div id='mediaspace'>This text will be replaced</div>
<script type='text/javascript'>
var so = new SWFObject('forum/swplayers/flash/player.swf','mpl','300','24','9');
so.addParam('allowfullscreen','true');
so.addParam('allowscriptaccess','always');
so.addParam('wmode','opaque');
so.addVariable('file','{param}');
so.write('mediaspace');
</script>
to make it sure that your address work you can use as full URL like :
http://yourdomain.com/forum/swplayers/flash/player.swf
and one more thing , for mp3 players i will update this mod to google player which in more faster and no error whitin it will you have.