TypeError: record.get is not a function

错误信息为：TypeError: record.get is not a function 
                custCardCode.setValue(record.get('custCardCode'));

    items : [{
                            xtype : 'button',
                            text : '确定',
                            listeners : {
                                'click':function(){
                                    var grid = Ext.getCmp('custCardCode-grid');    
                                    var record = grid.getSelectionModel().getSelection();
                                    if(record.length == 0){
                                        Ext.Msg.alert('提示', '请选择一条记录！');
                                        return;
                                    }
                                    var custCardCode = Ext.getCmp(me.custCardCodeId);
                                    if(custCardCode){
                                        custCardCode.setValue(record.get('custCardCode'));  //提示错误处   
                                        //解决方法  custCardCode.setValue(record[0].get('custCardCode'));
                                    }
                                    me.close();
                                }
                            }
                        }]