GWT-EXT 问题 JavaScriptException: (TypeError)

报错信息：

Caused by: com.google.gwt.core.client.JavaScriptException: (TypeError) @com.gwtext.client.widgets.Component::checkExtVer()([]): 无法获取未定义或
null 引用的属性“StatusBar”

at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:249)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeBoolean(ModuleSpace.java:199)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeBoolean(JavaScriptHost.java:35)
at com.gwtext.client.widgets.Component.checkExtVer(Component.java)
at com.gwtext.client.widgets.Component.<clinit>(Component.java:108)

... 12 more

我的项目：
mytestgwt

MyTestGwt.gwt.xml 文件部分内容：

<module rename-to='mytestgwt'>

  <!-- Inherit the core Web Toolkit stuff.                        -->

  <inherits name='com.google.gwt.user.User'/>

  <inherits name='com.google.gwt.json.JSON'/>

  

  <!-- GWT-EXT    -->

  <inherits name="com.gwtext.GwtExt"/>  

  <!-- Specify the app entry point class.                         -->

  <entry-point class='com.test.client.MyTestGwt'/>

项目目录：



问题已经找到解决方法。

1.现在项目源码中  public 文件夹中添加 js/ext 文件夹，然后将  gwt-ext.zip 文件中 adapter，resources 文件夹和  ext-base.js，ext-all.js，ext-lang-zh_CN.js，uxpagingtoolbar.js，uxutil.js，exportfile.js
文件复制到 public/js/ext 目录下。

2.在项目主页面 html （我的主页 MyTestGwt.html) 文件中添加如下内容：

<div id="loading">

<div class="loading-indicator">

    <img src="mytestgwt/js/ext/resources/images/default/shared/large-loading.gif" width="32" height="32"

          style="margin-right:8px;float:left;vertical-align:top;"/>载入GWT-EXT模块JS脚本<br/>

        <span id="loading-msg">加载图片</span></div>

</div>

<!--include the Ext CSS, and use the gray theme-->

<link rel="stylesheet" type="text/css" href="mytestgwt/js/ext/resources/css/ext-all.css"/>

    

<!--include the Ext Core API-->

<script type="text/javascript">document.getElementById('loading-msg').innerHTML = '加载核心代码...';</script>

<script type="text/javascript" src="mytestgwt/js/ext/adapter/ext/ext-base.js"></script>

<!--include Ext -->

<script type="text/javascript">document.getElementById('loading-msg').innerHTML = '加载界面组件...';</script>

<script type="text/javascript" src="mytestgwt/js/ext/ext-all.js"></script>

<script type="text/javascript" src="mytestgwt/js/ext/ext-lang-zh_CN.js"></script>

<!--include Extend -->

<script type="text/javascript">document.getElementById('loading-msg').innerHTML = '加载扩展组件...';</script>

<script type="text/javascript" src="mytestgwt/js/extux/uxpagingtoolbar.js"></script>

<script type="text/javascript" src="mytestgwt/js/extux/uxutil.js"></script>

<script type="text/javascript" src="mytestgwt/js/extux/exportfile.js"></script>

<!--include the application JS-->

<script type="text/javascript">document.getElementById('loading-msg').innerHTML = '加载应用组件...';</script>

    <script type="text/javascript" language="javascript" src="mytestgwt/mytestgwt.nocache.js"></script>

<!--hide loading message-->

<script type="text/javascript">Ext.get('loading').fadeOut({remove: true, duration:.25});</script>