Unable to open LoadUI in fedora Linux

Hi,

I am having the OS is fedora Linux. I installed the load UI in my machine which works fine. But past 5 days it is not working. If i tried to open loadui getting the error message "Unable to launch the application" and "java.net.UnknownHostException: dl.javafx.com" is a exception error. Here i am attaching the screen shot for exeception error. Please give a reply if any body knows. I need very urgent.

Thanks in advance.