node.js - Mongoose error on creating Model (using Step) -

when trying create model in mongoose following error

[typeerror: cannot read property 'options' of undefined]

i have no idea what's causing it

"use strict"; var step = require('step'); var mongoose = require('mongoose'); var schema = mongoose.schema;  function randomfunction() {     var categoryschema = new schema({         id: number,         name: string,         description: string     }, { collection: 'categories' });      var category;      //...      mongoose.connect('mongodb://localhost/grouping');      new step(         function() { //connect mongodb             var db = mongoose.connection;             db.on('error', console.error.bind(console, 'connection error:'));             db.on('open', this);         },         function() {  //create model             console.log(categoryschema); //logs schema object right             category = mongoose.model('category', categoryschema);           },         function(err) {             console.log(err);  //error here         });     //... } 

i'm new mongo (and new node) have absolutely no idea error message means.

i know have options defined in schema cant see how undefined, can point me in right direction?

note - big cut out of original code, general structure (there's code below mongoose.model('cat... gets skipped, assume because error thrown mongoose.model call not console.log("hello"); printed straight after it.

edit i've found inside mongoose (mongoose/lib/document.js) tries this.schema it's undefined

function document (obj, fields, skipid) { //line 37     this.$__ = new internalcache;     this.isnew = true;     this.errors = undefined;      var schema = this.schema; //-> undefined     // ... 

so turns out i'm not observent kind,

mongoose.model should mongoose.model