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Node js workspace not working

1) i have written some code in app.js

function printMessage(userName, badges, jsPoints) { var message = "The " + userName + " has " + badges+ " badges and "+ jsPoints+" javaScriptoints"; console.log(message); }

printMessage("Rajashekar", 100, 400);

2) then trying to call from console treehouse:~/workspace$ node app.js

3) but getting exception like ReferenceError: printMessage is not defined
at repl:1:1
at REPLServer.defaultEval (repl.js:252:27)
at bound (domain.js:287:14)
at REPLServer.runBound [as eval] (domain.js:300:12)
at REPLServer.<anonymous> (repl.js:417:12)
at emitOne (events.js:82:20)
at REPLServer.emit (events.js:169:7)
at REPLServer.Interface._onLine (readline.js:210:10)
at REPLServer.Interface._line (readline.js:549:8)
at REPLServer.Interface._ttyWrite (readline.js:826:14)

Can help me how would i resolve this