Error in launching Java Web Start Applications

I followed all steps in this tutorial to create an JWS app but after downloading the .jnlp file, I couldn't run the .jnlp file.

Here is the error announcement(open this image in a new tab to see it more clearly) By the way, from where should I jar all classes? In this example, I wrote the command line: jar -cf TestJnlp.jar*.* from within E:\Java\CuongNguyen\project04.