little help

sir
    , while going through the process of configuration
of Tomcat to work with SSL i received the following
errors
can u please help me to come up with this error.
i am working on windows.

steps i did
------------------
1) set the env variable for Tomcat =>CATLINA_HOME
2) set the CLASSPETH of JSSE
3)excuted the following command 
  [%JAVA_HOME%\bin\keytool -genkey -alias tomcat      
-keyalg RSA]
  then it asked for the password and after setting the
password i get the following error

keytool error: java.lang.Exception: Key pair not
generated, alias <tomcat> alrea
dy exists

Amit kumar 
software engineer
Apsora India Ltd

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