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Asta Silva
Asta Silva

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How to Fix: "Namespace not specified" Gradle 8 Error in React Native & Expo

#reactnative #android #mobile #javascript

Fixing the "Namespace Not Specified" Error in React Native and Expo Android Builds

If you recently upgraded a project to React Native 0.73+ or bumped your Expo SDK to version 50+, you may have run into an Android build error that looks something like this:

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':react-native-some-old-library'.

> Namespace not specified for group 'react-native-some-old-library'
  and version '1.0.0' as per the Android Gradle Plugin 8.0+ guidelines.
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At first glance, it looks like something is wrong with your app. In most cases, it isn't.

The error is usually coming from an older dependency inside node_modules.

Here's what's actually causing it and how to fix it properly.

The Root Cause

Before Android Gradle Plugin (AGP) 8.0, Android libraries could define their package name inside AndroidManifest.xml.

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.someoldlibrary">
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Starting with AGP 8.0, that is no longer enough.

Every Android module is now expected to define a namespace inside its build.gradle file.

When you upgrade React Native or Expo, your Android tooling gets upgraded as well. The problem is that many older React Native libraries haven't been updated to follow the new requirement.

As soon as Gradle encounters one of those libraries, it stops during configuration and the build fails.

This started showing up much more frequently after Expo SDK 50 and newer React Native releases adopted newer Android tooling.

Before You Change Anything

Look closely at the error message.

Most of the time you'll see something like:

A problem occurred configuring project ':react-native-some-old-library'
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That project name is usually the library causing the issue.

A common mistake is to start editing your app's own Gradle files. In most cases, the problem is actually inside the dependency listed in the error.

The Fix: Use patch-package

Since the problem comes from a third-party library, editing files directly inside node_modules isn't a real fix.

The next time you run npm install, your changes will be overwritten.

Instead, make the change once and save it using patch-package.

Step 1: Find the Package Name

Navigate to the library's manifest file:

node_modules/react-native-some-old-library/android/src/main/AndroidManifest.xml
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Look for the package attribute:

<manifest
    package="com.someoldlibrary">
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Copy that value.

You'll use it as the namespace in the next step.

Step 2: Add the Missing Namespace

Open:

node_modules/react-native-some-old-library/android/build.gradle
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Find the android {} block and add the namespace at the top:

android {
    namespace "com.someoldlibrary"

    compileSdkVersion safeExtGet('compileSdkVersion', 34)

    defaultConfig {
        minSdkVersion safeExtGet('minSdkVersion', 21)
        targetSdkVersion safeExtGet('targetSdkVersion', 34)
    }

    // ...
}
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Make sure the namespace exactly matches the package name from the manifest.

Step 3: Generate a Patch

From your project root, run:

npx patch-package react-native-some-old-library
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This creates a file inside a new patches directory containing the modification you just made.

Commit that file to Git.

Step 4: Apply the Patch Automatically

Open package.json and add a postinstall script:

{
  "scripts": {
    "start": "expo start",
    "android": "expo run:android",
    "ios": "expo run:ios",
    "postinstall": "patch-package"
  }
}
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Now whenever someone runs npm install—whether it's you, another developer, CI, or EAS Build—the patch gets applied automatically.

That's It

Clear any caches if needed and run your Android build again.

The build should now complete normally.

More importantly, you won't have to keep making the same edit every time node_modules gets reinstalled.

If you're working with older React Native dependencies, this is usually the cleanest way to handle AGP 8 namespace issues without waiting for the library maintainer to release an update.

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