Unable to launch the application (topcoder arena) [solved]

sometimes after clicking "ContestAppletProd.jnlp" almost everyone (who use topcoder arena) have faced this kind of problem. didn't we?
here is the screenshot i am talking about. 

What can we do to resolve this problem? 

- All we have to do is Clearing Java Cache.

lets see how can we clear Java Cache in 3 simple steps (with picture).

Step1: Goto "C:\Program Files\Java\jre7\bin" and run "javacpl.exe". 

we can do it in another easier way. press start button, write "java" and then you will see "configure Java" appears. just click on it. 

Step2: Click "View" (General Tab -> Temporary Internet Files -> View) as shown in the picture. 

Step3: You will find "Competition Arena" here, select and remove it. 

That's it. you are done.

Now re-run the "ContestAppletProd.jnlp". You won't see the problem again. :)