java.lang.IllegalArgumentException: This path does not exist

java.lang.IllegalArgumentException: This path does not exist:

1...
function init()
{
uploadInit(document.forms[0].companyPic1,document.forms[0].upimg1,document.forms[0].delimg1);
}


<table width="85%" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
  <td width="50%" height="15" align="left" class="cs1">    请上传企业营业执照副本复印件（加盖公章）　
  <span class="hei12">
  <font color="#FF9933">    </font>
  </span>
  </td>
  <td width="40%" align="left" class="cs1">
  <html:text property="companyPic1" readonly="true" size="25"/>
  </td>
  <td width="20%" align="left" class="cs1">
  <table width="180" height="19" border="0" align="center" cellpadding="0" cellspacing="0">
  <tr>
  <td width="70" align="center" valign="middle" class="cs1">
  <input name="upimg1" type="button" value="上传" onClick="addFile(document.forms[0].companyPic1,this,document.forms[0].delimg1);" class="button4"/>
  </td>
  <td width="110" align="left" class="cs1">
  <input name="delimg1" type="button" value="删除" onClick="delFile(document.forms[0].companyPic1,this,document.forms[0].upimg1);" class="button4"/>
  </td>
  </tr>
  </table>

2....
function addFile(obj,dsb,enb)
{
f = window.showModalDialog("upfile.jsp","","dialogHeight:200px;dialogWidth:400px;center:Yes;help:No;resizable:No;status:no","");