Error: blackberry-nativepackager cannot be found on the path

I have develop phonegap application for IOS,Android,windows and now it's time to blackberry, but when time to set up phonegap blackberry i got err,i m using CLI cordovo command with use of node.js as i follow below instruction to create project but i at developing time i got below err.

Error: blackberry-nativepackager cannot be found on the path.

• Build Projectt :build project :navigate to project folder and cmd command : ant blackberry build

• Register with server : blackberry-signer -register -csjpin 123 -cskpass @123 client-RDK-20**.csj

• sign app : blackberry-signer -storepass *@123 test.bar

• install app : blackberry-deploy -installApp -password @123 -device 192... -package test.bar -password *@123 ((Navigate to sdk path bin folder under dependency ))

• Ref site : http://inflagrantedelicto.memoryspiral.com/2011/02/blackberry-playbook-code-signing-process/