sencha 2.4 [ERR] Unknown command: "package"

Question

I've installed all Required Software for sencha followed by sencha docs on my Ubuntu 14.04

• Download and unzip Sencha Touch 2.4
• Sencha Cmd 5.0
• Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
• ruby 1.9.3p484 (2013-11-22 revision 43786) [x86_64-linux]
• Android SDK L

then I generate an application with:

$ mkdir MyApp
$ cd MyApp
$ sencha -sdk /path/to/touch generate app MyApp .

follow sencha first app docs and change content of MyApp, After that build it using this command: $sencha app build, then create android simulator packager json called androidsim.json.

    {
    "applicationName":"MyApp",
    "applicationId":"com.test.myapp.app",
    "versionString":"1.0",
    "versionCode":"1",
    "icon": {
        "36":"resources/icons/Icon_Android36.png",
        "48":"resources/icons/Icon_Android48.png",
        "57":"resources/icons/Icon.png"
    },
    "inputPath":"/path/to/MyApp/",
    "outputPath":"/path/to/MyApp/build/",
    "configuration":"Debug",
    "platform":"AndroidSimulator",
    "notificationConfiguration":"debug",
    "sdkPath":"/path/to/android-sdks", //mention the SDK path on your system
    "androidAPILevel":"20",
    "permissions":[
        "INTERNET",
        "ACCESS_NETWORK_STATE",
        "CAMERA",
        "VIBRATE",
        "ACCESS_FINE_LOCATION",
        "ACCESS_COARSE_LOCATION",
        "CALL_PHONE",
        "RECORD_AUDIO",
        "RECORD_VIDEO",
        "READ_CONTACTS",
        "WRITE_CONTACTS",
        "ACCESS_NETWORK_STATE"
    ],
    "orientations": [
        "portrait",
        "landscapeLeft",

        "landscapeRight",
        "portraitUpsideDown"
    ]
}

but after I run sencha app package run androidsim.json i got error [ERR] Unknown command: "package" following sencha building doc.

thanks for help :/