项目JSP的login页面点击按钮弹出error:[object object]

<%@page import="com.kcb.common.constant.Constants"%>
<%@ page contentType="text/html; charset=utf-8" %>
<%@ page import ="java.net.*" %>
<%
request.setCharacterEncoding("utf-8");
String basePath = request.getContextPath() + "/";
int port = request.getServerPort();
String ip = request.getServerName();
String enable_transport_domain = Constants.ENABLE_TRANSPORT_DOMAIN;
session.removeAttribute(Constants.SESSION_USER);
InetAddress s = InetAddress.getLocalHost();
System.out.println(request.getRemoteHost());
%>
<jsp:include page="../common/head/header.jsp"></jsp:include>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>用户登录</title>
<link rel="stylesheet" type="text/css" href="style/login.css">
<script type="text/javascript">var isCookieChecked = false;
var ipAddress = '<%=ip%>';
var url = '<%=basePath%>';
var enableTransportDomain = '<%=enable_transport_domain%>';
var ipPort = '<%=port%>';
function getCookie (c_name) {
if (document.cookie.length > 0) {
var c_start = document.cookie.indexOf(c_name + "=")
     if (c_start != -1) { 
         c_start = c_start + c_name.length + 1;
         var c_end = document.cookie.indexOf("^", c_start);
         if (c_end == -1)
             c_end = document.cookie.length;
         return unescape(document.cookie.substring(c_start, c_end));
     } 
   }
return "";
}function setCookie (c_name, n_value, p_name, p_value, expiredays) {
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name + "=" + escape(n_value) + "^" + p_name + "=" + escape(p_value) + ((expiredays == null) ? "" : "^;expires=" + exdate.toGMTString());
}function cleanCookie (c_name, p_name) {
document.cookie = c_name + "=" + "^" + p_name + "=" + "^;expires=Thu, 01-Jan-70 00:00:01 GMT";
isCookieChecked = false;
}function checkCookie () {
    var username = getCookie('username');
    var password = getCookie('password');
    if (username != null && username != "" && password != null && password != "") {
     document.getElementById("username").value = username;
        document.getElementById("password").value = password;
     return true;
    }
}function resetForm () {
cleanCookie("username", "password");
document.getElementById("logCheck").style.display = "";
document.getElementById("keepPwdCh").style.display = "";
document.getElementById("keepPwdLable").style.display = "";
document.getElementById("username").value = "";
    document.getElementById("password").value = "";
}
</script>
    <script>
    //dwr.engine.setAsync(false);
    $(document).ready(function() {
     $('#verCode')[0].value="";
    
     $('#logSubmitButton').click(function() {
     //alert($('#username').val()+'a');
     if($('#username').val()=='' || $('#password').val()=='')
     {
     $("#loginwarning").html("用户名或密码不能为空！");
     return;
     }
     var remeberPwd;
     if (true == isCookieChecked) {
//     document.getElementById("verCode").value = "00";
     remeberPwd = true;
     }
     else {
     remeberPwd = false;
     }
    
     var data = {
     username:$('#username').val(),
     password:$('#password').val(),
     verCode:$('#verCode').val(),
     remeberPwd:remeberPwd
     }
     $callTask("login.validate",data,function(msg){
     if(msg.state == -1){
 $("#loginwarning").html('验证码错误！');
 resetValidateCode();
 return;
}
    if(msg.state == -2){
$("#loginwarning").html('用户名或者密码错误！');
resetForm();
resetValidateCode()
}else {
if (true == document.getElementById("keepPassword").checked) {
setCookie('username', $('#username').val(), 'password', $('#password').val(), 365);
}
if(enableTransportDomain == 'true'
||ipAddress.indexOf("127.0.0.1")>-1
||ipAddress.indexOf("192.168")>-1
||ipAddress.indexOf("localhost")>-1
||ipAddress.indexOf("ewp.kucangbao.com")>-1
){
top.window.location.href = "index.jsp";
}else{
return null;
}
}
     });
        });
    });
    
    function resetValidateCode(){
     dojo.byId('verCode').value="";
     dojo.byId('logVerCodeImg').src='random.jsp?'+new Date().getTime();
    }
    function onKeyup(e){
     if(e.keyCode == 13){
     $('#logSubmitButton').click();
     }
    }
    </script>
 </head>
<body>
<div id="loginHeader">

</div>
<div id="loginContainer">
<% if(ip.indexOf("gto.kucangbao.com")!=-1){ %>
<div id="loginPanel_gto" class="fr">
<%}else{ %>
<div id="loginPanel" class="fr">
<%} %>
<div class="loginContent">
<div class="filed">
<label>用户名</label>
<input id="username" type="text" name="username" />
</div>
<div class="filed">
<label>密　码</label>
<input id="password" type="password" name="password" />
</div>
<div id="logCheck" class="filed">
<label>验证码</label>
<input id="verCode" type="text" name="verCode" onkeypress="onKeyup(event);"/>
<image  id="logVerCodeImg" class="verCodeImg" src="random.jsp">
<a id="logVerCodeLink" class="logLink" onclick="javascript:resetValidateCode()"><span>看不清<br/>换一张</span></a>
</div>
<div class="loginwarning" id="loginwarning"></div>
<div class="submit">
<table width="200" border="0" cellspacing="0" cellpadding="0">
   <tr>
   <td><button id="logSubmitButton" class="submitButt" type="button">登录</button></td>
   <td id="keepPwdCh"><input style="display:inline;float:left;" id="keepPassword" type="checkbox"/></td>
   <td><span class="logLink" id = "keepPwdLable" onmouseover="this.style.cursor='default';" onclick="document.getElementById('keepPassword').checked=!(document.getElementById('keepPassword').checked);">记住密码<br/></span></td>
   </tr>
   </table>
</div>
</div>
</div>
<% if(ip.indexOf("gto.kucangbao.com")!=-1){ %>
<div id="systemIntro_gto" class="fr"></div>
<%}else{ %>
<div id="systemIntro" class="fl">
<div class="introduceWrap">
<p class="introduce">我们一直致力于为客户打造一站式的用户体验，<br/>提供良好的解决方案。
</p>
</div>
<div class="phoneWrap">
<p class="phone">
</p>
</div>
</div>
<%} %>
<div style="clear:both"></div>
</div>

<script type="text/javascript">
if (true == checkCookie()) {
isCookieChecked = true;
document.getElementById("logCheck").style.display = "none";
document.getElementById("keepPwdCh").style.display = "none";
document.getElementById("keepPwdLable").style.display = "none";
}
</script>
</body>
</html>