Oracle Forms

Hi I am configuring webutil on xp machine with IDS 10g R2 and oracle DB 10g R2, I have followed the procedure and when signing the webutil I get the following error.. and after that when I run my form it hangs totally

C:\DevSuiteHome_1\forms\webutil>sign_webutil.bat c:\devsuitehome_1\forms\java\fr
mwebutil.jar
Generating a self signing certificate for key=webutil2...
keytool error: java.lang.Exception: Key pair not generated, alias <webutil2> alr
eady exists
.
There were warnings or errors while generating a self signing certificate. Pleas
e review them.
.
Backing up c:\devsuitehome_1\forms\java\frmwebutil.jar as c:\devsuitehome_1\form
s\java\frmwebutil.jar.old...
1 file(s) copied.
Signing c:\devsuitehome_1\forms\java\frmwebutil.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.

C:\DevSuiteHome_1\forms\webutil>sign_webutil.bat c:\devsuitehome_1\forms\java\ja
cob.jar
Generating a self signing certificate for key=webutil2...
keytool error: java.lang.Exception: Key pair not generated, alias <webutil2> alr
eady exists
.
There were warnings or errors while generating a self signing certificate. Pleas
e review them.
.
Backing up c:\devsuitehome_1\forms\java\jacob.jar as c:\devsuitehome_1\forms\jav
a\jacob.jar.old...
1 file(s) copied.
Signing c:\devsuitehome_1\forms\java\jacob.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.


C:\DevSuiteHome_1\forms\webutil>
]

Pls give me wayforward to overcome this error.

Rgds