新手问题又来了

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this.config[a] is undefined
[在此错误处中断] Ext.DomHelper=function(){var n=null;va...xt.History,new Ext.util.Observable());

Ext.onReady(function(){
var store = new Ext.data.JsonStore({
url:"http://localhost:8080/Ext/EditGridServlet",
fields:["name","sex","birthday","other"]

});
var editGrid = new Ext.grid.EditorGridPanel({
store:store,
title:"EditGrid",
width:600,
autoExpandColumn: "other",
autoHeight:true,
columns:[
{header:"姓名",width:150,dataIndex:"name",sortable:true,
editor:new Ext.grid.GridEditor(new Ext.form.TextField({allowBlank:false}))},
{header:"性别",width:150,dataIndex:"sex",sortable:true,
editor:new Ext.grid.GridEditor(new Ext.form.TextField())},
{header:"出生日期",width:150,dataIndex:"birthday",sortable:true,editor:new Ext.grid.GridEditor(new Ext.form.DateField({format:"Y-m-d"}))},
{header:"其他信息",width:150,dataIndex:"other",sortable:true,editor:new Ext.grid.GridEditor(new Ext.form.TextField())}
]
});
editGrid.render(Ext.getBody());
editGrid.getStore().load();



})

昨天那个高手快来啊