Can someone please explain what is wrong with this code and how to fix it? (JavaScript closure) : <p>Could someone please explain what is wrong with this code and how to fix it? I'm truly lost. Thanks! </p>

<pre><code>var messageProcessing = function() {
    console.log(message);
};

process.on('message', function(message) { 
    messageProcessing();
});
</code></pre>
