How to Resolve the “Unable to Load Script from Assets” Error in React Native on Windows

How to Resolve the "Unable to Load Script from Assets" Error in React Native on Windows

6 June 2024 Stephan Petzl Leave a comment Tech-Help

Running your first React Native project and encountering issues can be frustrating. One common error that developers face is the “Unable to load script from assets” error when trying to run their React Native project on an Android device. This guide will provide step-by-step instructions to resolve this error effectively.

Understanding the Issue

This error typically occurs because the JavaScript bundle that your React Native application needs is not found in the expected directory on your Android device. Here are some common causes:

  • The assets directory is missing or incorrectly configured.
  • Network configurations or permissions are not properly set up.
  • Issues with the development server or the build process.

Step-by-Step Solution

Follow these steps to resolve the “Unable to load script from assets” error:

1. Create the Assets Directory

First, ensure that the assets directory exists in your project structure. If it doesn’t, create it manually:

mkdir android/app/src/main/assets

2. Bundle the JavaScript File

Next, bundle the JavaScript file and place it in the newly created assets directory:

react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/ --assets-dest android/app/src/main/res

3. Run the Application

Finally, run your React Native application:

react-native run-android

Automating the Process

To streamline this process, you can add a script to your package.json file:

"scripts": {
    "android-linux": "react-native bundle --platform android --dev false --entry-file index.js --bundle-output android/app/src/main/assets/ --assets-dest android/app/src/main/res && react-native run-android"

Now, you can simply run npm run android-linux to execute the necessary steps.

Additional Tips

If you are running your application on a physical device and still encountering issues, try running the following command:

adb reverse tcp:8081 tcp:8081

This command sets up port forwarding between your device and the development server, which can resolve connectivity issues.

Using Repeato for Automated Testing

To further enhance your development workflow, consider using Repeato, a no-code test automation tool for iOS and Android. Repeato allows you to create, run, and maintain automated tests for your apps quickly and efficiently. With its computer vision and AI-based approach, Repeato simplifies the testing process, enabling developers to focus on building great products instead of spending time on test maintenance.

Repeato also empowers non-technical team members, such as QAs, to handle test automation tasks, fostering collaboration within your team. For more information on how Repeato can assist you, visit our Getting Started page.

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