When I try to use the upload files button I get the following message -

 

Silverlight: The upload task is interrupted!

Web Exception :

UnknownError,[HttpWebRequest_WebException_RemoteServer]

Arguments: NotFound

Debugging resource strings are unavailable. Often the key and arguments provide sufficient information to diagnose the problem. See http://go.microsoft.com/fwlink/?linkid=106663&Version=4.0.60129.0&File=System.Windows.dll&Key=HttpWebRequest_WebException_RemoteServer

 

Can anyone help.

 

The site is hosted on linux servers.

My PC is Windows 7 ie8, I aslo tried it on a Vista PC but got the same issue.
Also happens if I use firefox.

 

I'll try on an XP machine and a Mac next to see if I get the same error.