# reader.read is not a function error

**URL:** <https://forum.shopware.com/t/reader-read-is-not-a-function-error/19077>\
**Category:** Shopware 3.5\
**Tags:** programming\
**Created:** [14. März 2014 um 14:58 UTC](https://forum.shopware.com/t/reader-read-is-not-a-function-error/19077 "2014-03-14T14:58:00Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![developer-007](https://avatars.discourse-cdn.com/v4/letter/d/51bf81/32.png) [@developer-007](https://forum.shopware.com/u/developer-007)\
**Post date:** [14. März 2014 um 14:58 UTC](https://forum.shopware.com/t/reader-read-is-not-a-function-error/19077/1 "2014-03-14T14:58:00Z")

</div>

Hi, In my plugin code I have one issue before load combobox listing from json data. In console i got error. [color=red]reader.read is not a function result = reader.read(me.extractResponseData(response));[/color] I have made one model in json.js ` Ext.define('GoogleCategoryList', { extend: 'Ext.data.Model', fields: [{name:'ID', type:'int'}, {name:'Name', type:'string'}] }); ` And this is my view file code ` Ext.define('Shopware.apps.ProductField.view.detail.Window', { override: 'Shopware.apps.Article.view.detail.Window', createDescriptionFieldSet: function() { Ext.require('GoogleCategoryList'); var articleMain = Ext.create('Ext.data.Store', { extend: 'Ext.data.Store', model: 'GoogleCategoryList', requires: ['GoogleCategoryList'], autoLoad: true, proxy: { limitParam: undefined, startParam: undefined, paramName: undefined, pageParam: undefined, noCache:false, type: 'ajax', url: "My proxy server url for json data", reader: { type: 'json', root: 'categoryList', totalProperty: 'numFound' } } }); articleMain.load(); var me = this, fields = me.callParent(arguments); fields.add({ xtype: 'textfield', name: 'attribute[swagProductType]', fieldLabel: 'Product Type :', labelWidth: 155, margin: '0 0 15', cls: Ext.baseCSSPrefix + 'test-description-long', }); fields.add({ fieldLabel:'Google Product Category', xtype:'combo', name:'attribute[swagGoogleProductCategory]', forceSelection: true, typeAhead: true, allowBlank: false, emptyText: 'Choose Google Product Category', store: articleMain, displayField: 'Name', valueField: 'ID', id: 'swagGoogleProductCategory', }); return fields; } }); ` Can eny one have the solution ?