Unable to load script. Make sure you're either running a Metro server (run 'react-native start') or that your bundle 'index.android.bundle' is packaged correctly for release.

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[alina-beck]

I have the same issue after upgrading from react-native 0.61.5 to 0.63.2.

• Debug mode works fine, when running npx react-native run-android and yarn start in a separate terminal window.
• Release build works fine, when running npx react-native run-android --variant=Release.
• Staging build installs without problems but crashes after splash screen, when running npx react-native run-android --variant=Staging. When running from Android Studio it logs the ☝️ error:

Unable to load script. Make sure you’re either running a Metro server (run ‘react-native start’) or that your bundle ‘index.android.bundle’ is packaged correctly for release.

These are the buildTypes settings in my android/app/build.gradle (working fine for previous versions of react-native):

    buildTypes {
        debug {
            resValue "string", "CodePushDeploymentKey", '""'
        }
        staging {
            resValue "string", "CodePushDeploymentKey", '"******"'
            signingConfig signingConfigs.release
            matchingFallbacks = ['release']
        }
        release {
            minifyEnabled enableProguardInReleaseBuilds
            proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
            resValue "string", "CodePushDeploymentKey", '"******"'
            signingConfig signingConfigs.release
        }
    }

Please help! All the “solutions” I found so far were either suggesting to start a Metro Instance, or adding an assets folder (which already exists in my project), or running a three-lines-long bundle command – but surely there must be a better way!?

Update: Adding bundleInStaging: true to my app/build.gradle as suggested in this answer solved this problem for me! 🎉

[jihadrhamza]

I have solved the problem using the below steps.

1. Updated nodejs to the latest version.
2. Deleted the all the contents from .gradle(C:/Users/xxx/.gradle) folder (You may skip this in the initial attempt)
3. I created project using,

   react-native init MyApp

4. Move to the project folder.

   cd MyApp

5. I was getting some blacklist.js some character issue. For that I referred this link and replaced sharedBlacklist character set. (https://stackoverflow.com/questions/58120990/how-to-resolve-the-error-on-react-native-start/58122821#58122821)
6. Next, I ran the below code snippet to address the bundle issue.( Ref Link : https://medium.com/@adityasingh_32512/solved-unable-to-load-script-from-assets-index-android-bundle-bdc5e3a3d5ff)

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

7. react-native run-android Then, it started working. Hope this helps.