Oracle Forms

Hi. I'm attempting to use sign_webutil.bat to sign my icons.jar file. I'm getting an error. Can you help me resolve this?

C:\DevSuiteHome_1\forms\webutil>sign_webutil.bat c:\DevSuiteHome_1\forms\java\ic
ons.jar
Generating a self signing certificate for key=webutil2...
...successfully done.

.
Backing up c:\DevSuiteHome_1\forms\java\icons.jar as c:\DevSuiteHome_1\forms\jav
a\icons.jar.old...
        1 file(s) copied.
Signing c:\DevSuiteHome_1\forms\java\icons.jar using key=webutil2...
'jarsigner' is not recognized as an internal or external command,
operable program or batch file.
.
There were warnings or errors while signing the jar. Please review them.