Strange XPage error on the console.

I got a strange problem displaying on the Domino console

HTTP JVM: com.ibm.xsp.exception.EvaluationExceptionEx: Error while executing JavaScript action expression

The application works with no problem but this is showing on the console every 5 minutes on the console. Then I found that the error was a error inside the code in beforeRenderResponse event.

If found this by adding

try {

}catch(e){

print(e.toString())

}

around my code.