Google Chrome拡張

URL:http://developer.chrome.com/extensions/manifestVersion.html
manifest_versionのエラー

{                                                                                                                                                                                                
    "name": "My First Browser Action",                                             
    "description": "はじめての拡張！",                                             
    "version": "0.1",                                                              
    "manifest_version": 2,                                                         
    "background": {                                                                
        "scripts": ["background.js"]                                               
    },                                                                             
    "browser_action": {                                                            
        "default_icon": "icon19.png",                                              
        "default_title": "My First Extension",                                     
        "default_popup": "popup.html"                                              
    }                                                                              
}

"manifest_version": 2,
が必要