Error message while using DWR

Hello all,
I am having an error regarding DWR (I have the jar 3.0 version).
While using DWR, I am getting an error pop up (Please see the screenshot attached below) saying:
Error input parameter.
See logs for suggestions.

Empty Input parameter See log for suggestion
OK
My browser is internet explorer 8.0. Though I have found a solution for this, if I delete all the cookies of my then this error disappears, but it gets back soon.
I am looking for a permanent solution. Please anyone help me on this.
Thank you very much.
