extjs - Ext.data.Store created with no model -

after upgrading custom proxy extjs 4.1.0 4.2.*, stores broke in our application. i'm getting warning below. note, "warning" , not "error". don't see rendered in page, i'm not sure if thing broke.

javascript warning:

ext.data.store created no model. 

javascript warning screen shot:

call stack detail:

... line in javascript warning ext-all-dev.js 12300, actual line in code below 10974.

... see con[level](message);

... level = "warn"

extjs store:

var userstore = ext.create('ext.data.store', {     proxy: ext.create('ext.ux.aspwebajaxproxy', {         url: '/myapp/webservices/sharedservice.asmx/getdropdownoptions',         actionmethods: {             read: 'post'         },         extraparams: {             user_login: 'macgyver',             table_name: '[user]'         },         reader: {             type: 'json',             model: 'dropdownoption',             root: 'd'         },         headers: {             'content-type': 'application/json; charset=utf-8'         }     }),     autoload: true }); 

custom proxy:

adding model config store fixed warning, dealing bunch of new issues extjs 4.1.0 4.2.1 upgrade, difficult figure out went wrong. took different route since then. i'm implementing extdirect4dotnet server-side stack standard sencha ext.direct proxy. off shelf code framework .net 3.5, i'm in process of upgrading .net 4.0 , upgrading javascript code extjs 3.0.0 4.2.1. i'm 1/2 way there, crossing fingers.