Coding⏱️ 3 min read📅 2026-06-04

How to Fix: Angularjs: Error: [ng:areq] Argument 'HomeController' is not a function, got undefined

AngularJS dependency order issue

Quick Answer: Ensure that the controller is loaded after its dependencies, typically by ordering scripts in the HTML file or using a module loader like RequireJS.

📋 Table of Contents

  1. 🛑 Root Causes of the Error
  2. 🛠️ Step-by-Step Verified Fixes
  3. 🎯 Final Words

The AngularJS error '[ng:areq] Argument 'HomeController' is not a function, got undefined' occurs when the AngularJS framework is unable to resolve the HomeController as a valid function. This issue affects developers who are using AngularJS in their projects and are experiencing this specific error.

This error can be frustrating because it prevents the application from functioning correctly, causing unexpected behavior or errors. However, by following the steps outlined below, you should be able to resolve this issue and get your application up and running smoothly again.

🛑 Root Causes of the Error

  • The primary reason for this error is that the HomeController is not being loaded before it is referenced in another part of the application. In AngularJS, controllers are loaded when the module is initialized, but if they are referenced before the module is fully loaded, the framework will throw an error.
  • Another possible cause is that the HomeController has been moved or renamed and its new location is not being recognized by the AngularJS framework.

🛠️ Step-by-Step Verified Fixes

Loading scripts in the correct order

  1. Step 1: Step 1: Make sure that all scripts are loaded after the main application module. In your case, this means loading the MyService.js file before HomeController.js.
  2. Step 2: Step 2: Check if there are any other scripts or dependencies that need to be loaded before the HomeController.js script. If so, make sure they are in the correct order.
  3. Step 3: Step 3: Verify that the HomeController.js script is correctly referenced in your application. Make sure it is being included in the main application module and that its controller is being registered properly.

Verifying HomeController function

  1. Step 1: Step 1: Open the HomeController.js file and verify that it defines a function with the same name as the controller.
  2. Step 2: Step 2: Check if there are any syntax errors or missing dependencies in the HomeController.js file. Make sure it is correctly defined and exports a function.
  3. Step 3: Step 3: If the issue persists, try to recreate the HomeController.js file from scratch to ensure that it is correctly set up.

🎯 Final Words

By following these steps and ensuring that your scripts are loaded in the correct order and that the HomeController function is correctly defined, you should be able to resolve the AngularJS error '[ng:areq] Argument 'HomeController' is not a function, got undefined' and get your application up and running smoothly again.

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