SDK: ExtJS 4.1.1a
Platform: Windows x64

I make it through the entire build process executing the following command:

sencha app build
My pre-build index.html looks like so:

HTML Code:
<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8">
    <title>metrics_cmd_extjs</title>
    <link rel="stylesheet" href="resources/css/default/app.css">
    <link rel="stylesheet" href="resources/css/default/metrics.css">
    <link rel="stylesheet" type="text/css" href="ext/examples/ux/css/CheckHeader.css">
    <!-- <x-compile> -->
        <!-- <x-bootstrap> -->
            <script src="ext/ext-debug.js"></script>
            <script src="bootstrap.js"></script>               
        <!-- </x-bootstrap> -->
        <script src="app/app.js"></script>
    <!-- </x-compile> -->
</head>
    <body>
        <div id="logo"></div>
        <div id="loadingapp">Please wait...</div>
    </body>
</html>
My build index.html looks like this:

HTML Code:
<!DOCTYPE HTML>
<html>
<head>
    <meta charset="UTF-8">
    <title>metrics_cmd_extjs</title>
    <link rel="stylesheet" href="resources/css/default/app.css">
    <link rel="stylesheet" href="resources/css/default/metrics.css">
<script type="text/javascript" src="all-classes.js"></script>
</head>
    <body>
        <div id="logo"></div>
        <div id="loadingapp">Please wait...</div>
    </body>
</html>
I receive the following error in Chrome:

Uncaught TypeError: Cannot call method 'define' of undefined
Obviously the error is happening in the [build] produced file "all-classes.js"

HTML Code:
Ext.define("Ext.data.ResultSet"......
It seems to me there is a file not being included in my build index.html that defines Ext. Am I missing something here?