Require.js Error: Load timeout for modules: backbone,jquerymobile

I am trying to use r.js to optimize my code but I keep running to this error:

Tracing dependencies for: init

Error: Load timeout for modules: backbone,jquerymobile

The command I am running is this:

$ java -classpath /Users/dixond/build-tools/rhino1_7R4/js.jar:/Users/dixond/build-tools/closurecompiler/compiler.jar /Users/dixond/build-tools/r.js/dist/r.js -o /Users/dixond/Sites/omm_mobile/js/build.js

My build.js file looks like this:

( {
    //appDir: "some/path/",
    baseUrl : ".",
    mainConfigFile : 'init.js',
    paths : {
        jquery : 'libs/jquery-1.8.3.min',
        backbone : 'libs/backbone.0.9.9',
        underscore : 'libs/underscore-1.4.3',
        json2 : 'libs/json2',
        jquerymobile : 'libs/'
    packages : [],
    shim : {
        jquery : {
            exports : 'jQuery'
        jquerymobile : {
            deps : ['jquery'],
            exports : ''
        underscore : {
            exports : '_'
        backbone : {
            deps : ['jquerymobile', 'jquery', 'underscore'],
            exports : 'Backbone'
    keepBuildDir : true,
    locale : "en-us",
    optimize : "closure",
    skipDirOptimize : false,
    generateSourceMaps : false,
    normalizeDirDefines : "skip",
    uglify : {
        toplevel : true,
        ascii_only : true,
        beautify : true,
        max_line_length : 1000,
        defines : {
            DEBUG : ['name', 'false']

        no_mangle : true
    uglify2 : {},
    closure : {
        CompilerOptions : {},
        CompilationLevel : 'SIMPLE_OPTIMIZATIONS',
        loggingLevel : 'WARNING'
    cssImportIgnore : null,
    inlineText : true,
    useStrict : false,
    pragmas : {
        fooExclude : true
    pragmasOnSave : {
        //Just an example
        excludeCoffeeScript : true
    has : {
        'function-bind' : true,
        'string-trim' : false
    hasOnSave : {
        'function-bind' : true,
        'string-trim' : false
    //namespace: 'foo',
    skipPragmas : false,
    skipModuleInsertion : false,
    optimizeAllPluginResources : false,
    findNestedDependencies : false,
    removeCombined : false,
    name : "init",
    out : "main-built.js",
    wrap : {
        start : "(function() {",
        end : "}());"
    preserveLicenseComments : true,
    logLevel : 0,
    cjsTranslate : true,
    useSourceUrl : true

And my init.js looks like this:

      paths: {
          jquery:       'libs/jquery-1.8.3.min',
          backbone:     'libs/backbone.0.9.9',
          underscore:   'libs/underscore-1.4.3',
          json2 :       'libs/json2',
          jquerymobile: 'libs/'

      //shimming enables loading non-AMD modules
      //define dependencies and an export object
      shim: {
          jquerymobile: {
              deps: ['jquery'],
              exports: ''
          underscore: {
              exports: '_'
          backbone: {
              deps: ['jquerymobile', 'jquery', 'underscore', 'json2'],
              exports: 'Backbone'

requirejs(["backbone",], function(Backbone) {
    //Execute code here

What am I doing wrong in this build process?



Require.js has a Config option called waitSeconds. This may help.

RequireJS waitSeconds

Here's an example where waitSeconds is used:

    baseUrl: "scripts",
    enforceDefine: true,
    urlArgs: "bust=" + (new Date()).getTime(),
    waitSeconds: 200,
    paths: {
        "jquery": "libs/jquery-1.8.3",
        "underscore": "libs/underscore",
        "backbone": "libs/backbone"
    shim: {
        "underscore": {
            deps: [],
            exports: "_"
        "backbone": {
            deps: ["jquery", "underscore"],
            exports: "Backbone"

define(["jquery", "underscore", "backbone"],
    function ($, _, Backbone) {
        console.log("Test output");
        console.log("$: " + typeof $);
        console.log("_: " + typeof _);
        console.log("Backbone: " + typeof Backbone);

The Error

I recently had a very similar issue with an angularJS project using requireJS.

I'm using Chrome canary build (Version 34.0.1801.0 canary) but also had a stable version installed (Version 32.0.1700.77) showing the exact same issue when loading the app with Developer console open:

Uncaught Error: Load timeout for modules

The developer console is key here since I didn't get the error when the console wasn't open. I tried resetting all chrome settings, uninstalling any plugin, ... nothing helped so far.

The Solution

The big pointer was a Google group discussion (see resources below) about the waitSeconds config option. Setting that to 0 solved my issue. I wouldn't check this in since this just sets the timeout to infinite. But as a fix during development this is just fine. Example config:

<script src="scripts/require.js"></script>
    baseUrl: "/another/path",
    paths: {
      "some": "some/v1.0"
    waitSeconds: 0
  require( ["some/module", "my/module", "a.js", "b.js"],
    function(someModule,    myModule) {
      //This function will be called when all the dependencies
      //listed above are loaded. Note that this function could
      //be called before the page is loaded.
      //This callback is optional.

Most common other causes for this error are:

  • errors in modules
  • wrong paths in configuration (check paths and baseUrl option)
  • double entry in config

More Resources

Troubleshooting page from requireJS: point 2, 3 and 4 can be of interest.

Similar SO question: Ripple - Uncaught Error: Load timeout for modules: app

A related Google groups discussion:!topic/requirejs/70HQXxNylYg


In case others have this issue and still struggling with it (like I was), this problem can also arise from circular dependencies, e.g. A depends on B, and B depends on A.

The RequireJS docs don't mention that circular dependencies can cause the "Load timeout" error, but I've now observed it for two different circular dependencies.


Default value for waitSeconds = 7 (7 seconds)

If set to 0, timeout is completely disabled.



The reason for the issue is that Require.js runs into the timeout since the project might have dependencies to large libraries. The default timeout is 7 seconds. Increasing the value for this config option (called waitSeconds) solves it of course but it is not the right approach. Correct approach would be to improve the page loading time. One of the best technics to speed up a page loading is minification - the process of compressing the code. There are some good tools for minification like r.js or webpack.


I only get this error when running tests on Mobile Safari 6.0.0 (iOS 6.1.4). waitSeconds: 0 has given me a successful build for now. I'll update if my build fails on this again


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