Uncaught TypeError: Cannot read property 'should' of undefined

require.js:140 Uncaught Error: Mismatched anonymous define() module: function (){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
module.exports = require('./lib/chai');

},{"./lib/chai":2}],2:[function(require,module,exports){
/*!
 * chai
 * Copyright(c) 2011-2014 Jake Luer <[email protected]>
 * MIT Licensed
 */
... <chai.js source code continues> ...

}
http://requirejs.org/docs/errors.html#mismatch