Cannot read property 'length' of undefined问题

这是前台报的错误 sql我执行了有数据

 Uncaught TypeError: Cannot read property 'options' of null
    at replaceSelect (select_ui.js:917)
    at addSelect (select_ui.js:771)
    at initAllSelectUi (select_ui.js:728)
    at init (forwardNode.do?nodeName=StaffQuery:266)
    at wrappedFn (yahoo-dom-event.js:135)

应该是js哪个属性名错了把
这是js

 function queryTask(){
  YAHOO.util.Dom.setStyle("taskCont0","display","none");
  YAHOO.util.Dom.get("content0_message").innerHTML="<h2 class='default' onClick=\"ExChgClsName(this,'task0')\">员工信息</h2>";
  YAHOO.util.Dom.setStyle("taskCont0","display","");
  executeQuery(1,10);
}
//init on load
YAHOO.util.Event.addListener(window,'load',init);

options是null了能贴完整的代码吗，明显是你页面都没加载完就运行了js所以报异常

<%@ page contentType="text/html;charset=GBK"%>

员工查询
<%@ include file="/common/taglibs.jsp"%>
<%@ include file="/common/meta_css.jsp"%>

namespace="/personManage">

员工查询条件

                    <td class="bgc_tt short">
                        员工姓名：
                    </td>
                    <td class="long">
                        <s:textfield name="userName" cssClass="input_v w_22"
                            ondblclick="getPersonByIns(this, 'StaffCode', '0,1', 'Y','0000','');"
                            onchange="code_CodeChange(this, 'StaffCode', '-1,0', 'Y','0000','');" />
                    </td>

                </tr>
                <tr>
                    <td class="bgc_tt short">
                        归属机构/部门代码：
                    </td>
                    <td class="long">
                        <s:textfield name="staffManageCondition.comCode" id="staffManageCondition.comCode"
                            cssClass="input_v w_22"
                            ondblclick="code_CodeSelect(this, 'ComcodeAndDepartment', '0,1', 'Y','0000','sales.personManage.personQuery');"
                            onchange="code_CodeChange(this, 'ComcodeAndDepartment', '0,1', 'Y','0000','sales.personManage.personQuery');" />
                    </td>
                    <td class="bgc_tt short">
                        归属机构/部门名称：
                    </td>
                    <td class="long">
                        <s:textfield name="comCName" cssClass="input_v w_22"
                            ondblclick="code_CodeSelect(this, 'ComcodeAndDepartment', '-1,0', 'Y','0000','sales.personManage.personQuery');"
                            onchange="code_CodeChange(this, 'ComcodeAndDepartment', '-1,0', 'Y','0000','sales.personManage.personQuery');" />
                    </td>
                </tr>

                <tr style="display: none;">
                    <td class="bgc_tt short">
                        归属团队代码：
                    </td>
                    <td class="long">

                        <s:textfield name="staffManageCondition.teamCode" id="staffManageCondition.teamCode" cssClass='input_v w_22'
                            ondblclick="checkQueryComCode(this, '1','1','TeamCodeByComOrDepartment')"
                            onchange="checkQueryComCode(this, '2','1','TeamCodeByComOrDepartment')"
                            />

                    </td>
                    <td class="bgc_tt short">
                        归属团队名称：
                    </td>
                    <td class="long">
                        <s:textfield name="teamName" cssClass="input_v w_22"
                            ondblclick="checkQueryComCode(this, '1','-1','TeamCodeByComOrDepartment')"
                            onchange="checkQueryComCode(this, '2','-1','TeamCodeByComOrDepartment')"
                            />
                    </td>
                </tr>
                <tr>
                    <td class="bgc_tt short">
                        岗位：
                    </td>
                    <td class="long" >
                    <div id="prpSstaffPositionAc" class="selectui-indiv">
                         <div class="selectConfig">
                               <div class="codeType">sysValue_StaffPosition</div>
                               </div>
                            <input id="prpSstaffPositionId" class="selectui-input" />
                              <s:hidden name="staffManageCondition.position" />
                            <div id="prpSstaffPositionId_Container" class="selectui-container"></div>
                    </div>

                    </td>

                    <td class="bgc_tt short">
                        效力状态：
                    </td>
                    <td class="long" >
                    <div id="prpScompanyValidStatusAc" class="selectui-indiv w_22">
                            <div class="selectConfig">
                                <div class="codeType">StaticSelect</div>
                            </div>
                            <s:select name="staffManageCondition.validStatus" id="validStatusId" cssClass="selectui-input w_13" 
                                list="#@java.util.LinkedHashMap@{'1':'在职','0':'离司'}"></s:select>
                            <div id="prpScompanyValidStatus_Container" class="selectui-container"></div>
                    </div>

                    </td>
                </tr>
                <tr>
                    <td colspan="4">
                        <center>
                            <%-- 通用按钮 --%>
                            <input type="button" class="button_ty" name="bpmsubmit"
                                value="查询" onclick="queryTask();" />
                        </center>
                    </td>
                </tr>
            </table>
        </div>
        <div id="taskCont0" />
            <div id="content0_message"></div>
            <div id="task0">
                <div id="content0_navigation" class="query" align="left"></div>
                <div id="content0" class="sort"></div>
                <div id="content0_navigation" class="query" align="left"></div>
            </div>

        </div>
    </s:form>
</body>

<%@ include file="/common/i18njs.jsp"%>
<%@ include file="/common/meta_js.jsp"%>

员工代码：

cssClass="input_v w_22"
ondblclick="getPersonByIns(this, 'StaffCode', '0,1', 'Y','0000','');"
onchange="code_CodeChange(this, 'StaffCode', '0,1', 'Y','0000','');" />