JavaWebStart启动的时候老是报“启动文件中缺少下列必需字段：<jnlp>”错误

<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+" codebase="http://223.254.102.53:8080/ddoa/officeWork/workflowManage/" href="designer.jnlp">
<information>
<title>Workflow Designer 3.0</title>
<vendor>可视化工作流系统</vendor>
<homepage href="index.html"/>
<description>可视化工作流系统</description>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.5+" max-heap-size="128m"/>
<jar href="bornsoft-workflow-designer.jar" main="true"/>
<jar href="commons-logging.jar" main="false"/>
<jar href="forms.jar" main="false"/>
<jar href="gef.jar" main="false"/>
<jar href="jdom.jar" main="false"/>
<jar href="log4j.jar" main="false"/>
<jar href="looks-1.1.2.jar" main="false"/>
<jar href="looks-win-1.1.2.jar" main="false"/>
<jar href="oscore-2.2.1.jar" main="false"/>
<jar href="osworkflow-2.7.0-dev.jar" main="false"/>
<jar href="plastic-1.1.2.jar" main="false"/>
<jar href="propertyset-1.3-30Dec03.jar" main="false"/>
<jar href="xalan.jar" main="false"/>
<jar href="xerces.jar" main="false"/>
<jar href="rachel.jar" main="false"/>
<jar href="skinlf.jar" main="false"/>
<jar href="houston-1.0-b1.jar" main="false"/>
</resources>
<application-desc main-class="com.bornsoft.workflow.designer.Studio"/>
</jnlp>

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--------常规：
启动/运行应用程序时发生错误。标题：Workflow Designer 3.0
供应商：可视化工作流系统
类别：启动文件错误启动文件中缺少下列必需字段：<jnlp>--------启动文件：
<html>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<head>
  <title>��ӭ���ʾ����ж޵���Эͬ�칫ƽ̨</title>
  <link rel="stylesheet" href="/ddoa/common/css/body.css" type="text/css">
  <script language="JavaScript" src="/ddoa/common/js/formCheck.js"></script>
</head><script language="JavaScript">function checkForm(){
if (isBlankString("userPin")){
    alert('"�û�����Ϊ��!');
    all.userPin.focus();
    return false;
  }
if (isBlankString("Password")){
    alert('"���롱����Ϊ��!');
    all.Password.focus();
    return false;
  }
this.disabled=true;all.submit();
}function formSubmit(faction){
   if(checkForm()){
   document.all.submit();
}
else document.all.reset();
}
-->
</script>
<script language="JavaScript">
</script>
<body background="/ddoa/images/bg_sub22.gif">
<table width="100%"  border="0" cellspacing="0" cellpadding="0" height="500px">
  <tr>
    <td valign="middle" align="center">
<table border="0" cellspacing="0" cellpadding="0">
      <tr>
        <td><img src="/ddoa/images/t22.jpg" width="398" height="144"></td>
      </tr>
      <tr>
        <td align="left">
<form name="loginform" action="loginAfter.jsp" method=post>
<table width="100%"  border="0" cellspacing="0" cellpadding="0" bgcolor="white">
          <tr>
            <td rowspan="4"><img src="/ddoa/images/x22.gif" width="102" height="49"></td>
            <td><span>�û���</span></td>
            <td><input type="text" name="userPin" class="input_txt1" size='13' maxlength='16's></td>
          </tr>
          <tr>
            <td>��  ��</td>
            <td><input type="password" name="Password" class="input_txt1" size='13' maxlength='16' ></td>
          </tr>
          <tr height="5px">
            <td colspan="2" align="center"> </td>          </tr>

          <tr>
            <td colspan="2" align="center"><input type=image id="enter" src="/ddoa/images/ok22.gif" onclick="return checkForm()"></td>          </tr>
          <tr>
            <td colspan="2" align="center"> </td>          </tr>

        </table>
</form>
</td>
      </tr>
    </table></td>
  </tr>
</table>
</body>
</html></form>
</body>
</html>
            --------主启动文件：
<?xml version="1.0" encoding="utf-8"?>
<jnlp spec="1.0+" codebase="http://223.254.102.53:8080/ddoa/officeWork/workflowManage/" href="designer.jnlp">
<information>
<title>Workflow Designer 3.0</title>
<vendor>可视化工作流系统</vendor>
<homepage href="index.html"/>
<description>可视化工作流系统</description>
<offline-allowed/>
</information>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.5+" max-heap-size="128m"/>
<jar href="bornsoft-workflow-designer.jar" main="true"/>
<jar href="commons-logging.jar" main="false"/>
<jar href="forms.jar" main="false"/>
<jar href="gef.jar" main="false"/>
<jar href="jdom.jar" main="false"/>
<jar href="log4j.jar" main="false"/>
<jar href="looks-1.1.2.jar" main="false"/>
<jar href="looks-win-1.1.2.jar" main="false"/>
<jar href="oscore-2.2.1.jar" main="false"/>
<jar href="osworkflow-2.7.0-dev.jar" main="false"/>
<jar href="plastic-1.1.2.jar" main="false"/>
<jar href="propertyset-1.3-30Dec03.jar" main="false"/>
<jar href="xalan.jar" main="false"/>
<jar href="xerces.jar" main="false"/>
<jar href="rachel.jar" main="false"/>
<jar href="skinlf.jar" main="false"/>
<jar href="houston-1.0-b1.jar" main="false"/>
</resources>
<application-desc main-class="com.bornsoft.workflow.designer.Studio"/>
</jnlp>-----------异常
MissingFieldException[ 启动文件中缺少下列必需字段：<jnlp>]
at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.LaunchDownload.getUpdatedLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.downloadResources(Unknown Source)
at com.sun.javaws.Launcher.handleApplicationDesc(Unknown Source)
at com.sun.javaws.Launcher.handleLaunchFile(Unknown Source)
at com.sun.javaws.Launcher.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)