Exception: java.io.IOException: HTTP response 404 : LaunchDesc: null ]

What's matter?

I checked URL in jnlp file several times. but I coudn't know how to do.

Error mesagge shows below,

[

Exception: java.io.IOException: HTTP response 404 : LaunchDesc: null ]

at com.sun.javaws.cache.DownloadProtocol.doDownload(Unknown Source)

...etc

]

Anybody help, plz?

[361 byte] By [fresh94] at [2007-9-26 1:15:49]