Errors running signed applet example

Oratorio (Oratorio@pemail.com)
Fri, 28 Nov 1997 19:54:53 -0500

Date: Fri, 28 Nov 1997 19:54:53 -0500
From: Oratorio <Oratorio@pemail.com>
To: java-security@web2.javasoft.com
Subject: Errors running signed applet example

I got the following messages when I ran the example at :
http://java.sun.com/security/signExample/
# Error: Invalid Hash of this JAR entry (-7882)
# jar file: c:\temp\jzipR7A6.TMP
# path: writeFile.class
# Error: Strange PKCS7 or RSA failure (-7881)
# jar file: c:\temp\jzipR7A6.TMP
# path: c:\temp\jzipR7A6.TMP
# Error: loading of signatures has failed (-1)

Any idea how to fix this ? thanks