Sign Applet Error?

I use my existing pkcs#12 certificate (.pfx) to sign my applet code (without any key gen. before, directly sign the code by this certificate)

jarsigner -storetype pkcs12 -keystore C:\mycert.pfx AppletCode.jar keyEntries

Although the code can be signed, when i view this page, it prompts me "Certificate not verified" and with error:

java.security.cert.CertificateException: Check leaf key usage failed in certificate.

What is wrong? Any body can help me?

* I try to geneate one self-certificate by keytool to sign my code, it can be viewed properly.

[594 byte] By [SunnyLaw] at [2007-9-30 10:14:59]
# 1
I get this same error when launching a signed webstart app in Java 5.0.In 1.4.2.x and prior there is no problem at all.
aaronrh at 2007-7-3 17:58:56 > top of Java-index,Security,Signed Applets...