Google Chrome 'onLaunched' error in plugin

Question

I am following the google chrome web app development on http://developer.chrome.com/trunk/apps/first_app.html and the web app is not launching. when i click on the app icon on the page it closes the tab. I have downloaded the sample apps and plugins from github but they too are not working when i look at the console i get this error, please not i have enabled experimental API's in chrome://flags.

Uncaught TypeError: Cannot read property 'onLaunched' of undefined 

I have updated my chrome browser to version 22.0.1229.79. My manifest.json file is

{
"name": "Hello World!",
"description": "My first packaged app.",
"manifest_version": 2,

"version": "0.1",
"app": {
    "background": {
        "scripts": ["background.js"]
    }
},
"icons": {
    "16": "calculator-16.png", 
    "128": "calculator-128.png"
}

}

And my background.js file

   chrome.app.runtime.onLaunched.addListener(function() {
    chrome.app.window.create('window.html', {
        'width': 400,
        'height': 500
    });
});

Can someone point me where am going wrong?

Answer 1

This error also occurs if you leave out the "app": {} declaration in the manifest.json.

I.e. "background": { "scripts": [ "background.js" ] }, Will give this error.

And "app": { "background": { scripts": ["background.js"] }, will work properly.