Mismatched anonymous define() module

I'm getting this error when I browse my webapp for the first time (usually in a browser with disabled cache).

Error: Mismatched anonymous define() module: function (require) {

HTML:

<html>
   .
   .
   .
   <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.0/jquery.min.js"></script>
   <script> var require = { urlArgs: "v=0.4.1.32" }; </script>
   <script data-main="assets/js/main" src="assets/js/libs/require.js"></script>
   <script src="assets/js/ace/ace.js?v=0.4.1.32"></script>
   </body>
</html>

JS:

$(function () {
    define(function (require) {
        // do something
    });
});

Anyone know exactly what this error means and why it's happening?

source file, a short discussion about it in the github issues page

Solution

Like AlienWebguy said, per the docs, require.js can blow up if

You have an anonymous define ("modules that call define() with no string ID") in its own script tag (I assume actually they mean anywhere in global scope)
You have modules that have conflicting names
You use loader plugins or anonymous modules but don't use require.js's optimizer to bundle them

I had this problem while including bundles built with browserify alongside require.js modules. The solution was to either:

A. load the non-require.js standalone bundles in script tags before require.js is loaded, or

B. load them using require.js (instead of a script tag)