Troubleshooting - Unity SDK - Airbridge Help Center

A coroutine dependency error occurs during the build process

Issue

A coroutine dependency error occurs during the build process with the following message.

Text

java.lang.NoClassDefFoundError: kotlin/coroutines/AbstractCoroutineContextKey
    at java.base/java.lang.ClassLoader.defineClass1(Native Method)
    at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
  ...

Cause

If the kotlinx-coroutines-core library version is 1.3.5 or later, the kotlin-stdlib library version must be at a certain level or later.

Solution

Check whether the kotlin-stdlib library version is v.1.3.70 or later with the gradlew dependencies command. If the version is earlier than v.1.3.70, you need to update it.

Deeplink Opens generated through push notifications using the Braze SDK are not collected

Issue

Deeplink Open events that occur through the push notifications generated by the Braze SDK are not collected by Airbridge. Instead, the App Open event is collected.

Cause

The Airbridge Android SDK uses the dataString in the action and intent of the Activity to distinguish between Deeplink Open events and App Open events.When a user opens the app through a push notification using the Braze SDK, the app goes through NotificationTrampolineActivity. This activity handles push notifications, but the dataString is not included in its action and intent, preventing the SDK from determining if it’s a Deeplink Open event or an App Open event.

Solution

Add a custom Application class (CustomApplication.java) file as shown below.

package com.company.product;

import android.app.Activity;
import android.app.Application;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;

import co.ab180.airbridge.AirbridgeLifecycleIntegration;
import co.ab180.airbridge.unity.AirbridgeUnity;

public class CustomApplication extends Application {

    @Override
    public void onCreate() {
        super.onCreate();

        AirbridgeUnity.setLifecycleIntegration(new AirbridgeLifecycleIntegration() {

            @Nullable
            @Override
            public String getDataString(@NonNull Activity activity) {
                if (activity.getClass().getName().equals("com.braze.push.NotificationTrampolineActivity")
                        && activity.getIntent() != null
                        && activity.getIntent().getExtras() != null
                ) {
                    return activity.getIntent().getExtras().getString("uri");
                }
                return null;
            }
        });
    }
}

Add the custom Application class to the Custom Main Manifest (Assets/Plugins/Android/AndroidManifest.xml) file as shown below.

<?xml version="1.0" encoding="utf-8"?>
<manifest ...>
  
  <application android:name="com.company.product.CustomApplication"
    android:theme="@style/UnityThemeSelector"
    android:icon="@mipmap/app_icon"
    android:label="@string/app_name">

    ...

  </application>
</manifest>

The "Manifest merger failed" error occurs during the build process

Issue

The “Manifest merger failed” error occurs during the build process.

Cause

The Airbridge SDK’s AndroidManifest.xml includes rules to opt out of backing up the Shared Preferences data. The purpose of this rule is to avoid retaining the same Airbridge settings during the reinstallation of the app so that new installs or reinstalls can be detected accurately.Merging Airbridge SDK backup rules with your app backup rules can cause conflicts.

Solution

Below are the opt-out rules defined in the Airbridge SDK.

<?xml version="1.0" encoding="utf-8"?>
<data-extraction-rules>
    <cloud-backup>
        <exclude domain="sharedpref" path="airbridge-internal" />
        <exclude domain="sharedpref" path="airbridge-install" />
        <exclude domain="sharedpref" path="airbridge-user-info" />
        <exclude domain="sharedpref" path="airbridge-user-alias" />
        <exclude domain="sharedpref" path="airbridge-user-attributes" />
        <exclude domain="sharedpref" path="airbridge-device-alias" />
        <exclude domain="database" path="airbridge.db" />
    </cloud-backup>
    <device-transfer>
        <exclude domain="sharedpref" path="airbridge-internal" />
        <exclude domain="sharedpref" path="airbridge-install" />
        <exclude domain="sharedpref" path="airbridge-user-info" />
        <exclude domain="sharedpref" path="airbridge-user-alias" />
        <exclude domain="sharedpref" path="airbridge-user-attributes" />
        <exclude domain="sharedpref" path="airbridge-device-alias" />
        <exclude domain="database" path="airbridge.db" />
    </device-transfer>
</data-extraction-rules>

<?xml version="1.0" encoding="utf-8"?>
<full-backup-content>
    <exclude domain="sharedpref" path="airbridge-internal" />
    <exclude domain="sharedpref" path="airbridge-install" />
    <exclude domain="sharedpref" path="airbridge-user-info" />
    <exclude domain="sharedpref" path="airbridge-user-alias" />
    <exclude domain="sharedpref" path="airbridge-user-attributes" />
    <exclude domain="sharedpref" path="airbridge-device-alias" />
    <exclude domain="database" path="airbridge.db" />
</full-backup-content>

Fix conflict with fullBackupContent=“string”

Adding android:fullBackupContent="string" to the AndroidManifest.xml file may cause an error like the following.

Build Output

Manifest merger failed : Attribute application@fullBackupContent value=(string) from AndroidManifest.xml

To fix this error,

add xmlns:tools="http://schemas.android.com/tools" to the <manifest> tag
add tools:replace="android:fullBackupContent" to the <application> tag

in the Custom Main Manifest(Assets/Plugins/Android/AndroidManifest.xml) file.

Fix conflict with dataExtractionRules=“string resource”

Adding android:dataExtractionRules="string resource" to the AndroidManifest.xml file may cause an error like the following.

Build Output

Manifest merger failed : Attribute application@dataExtractionRules value=(string resource) from AndroidManifest.xml

To fix this error,

add xmlns:tools="http://schemas.android.com/tools" to the <manifest> tag
add tools:replace="android:dataExtractionRules" to the <application> tag

in the Custom Main Manifest(Assets/Plugins/Android/AndroidManifest.xml) file.

Fix conflict with allowBackup=“false”

Adding android:allowBackup="false" to the AndroidManifest.xml file may cause an error like the following.

Build Output

Manifest merger failed : Attribute application@allowBackup value=(false) from AndroidManifest.xml:32:9-36
    is also present at [:airbridge] AndroidManifest.xml:27:9-35 value=(true).
    Suggestion: add 'tools:replace="android:allowBackup"' to <application> element at AndroidManifest.xml:30:5-250:19 to override.

To fix this error,

add xmlns:tools="http://schemas.android.com/tools" to the <manifest> tag
add tools:replace="android:allowBackup" to the <application> tag

in the Custom Main Manifest(Assets/Plugins/Android/AndroidManifest.xml) file.

If compileSdkVersion is lower than 31

The android:dataExtractionRules has been added in API Level 31. Therefore, if the compileSdkVersion is lower than 31, an error like the following may occur.

Build Output

AndroidManifest.xml: AAPT: error: attribute android:dataExtractionRules not found.

To fix this error,

add xmlns:tools="http://schemas.android.com/tools" to the <manifest> tag
add tools:remove="android:dataExtractionRules" to the <application> tag

in the Custom Main Manifest(Assets/Plugins/Android/AndroidManifest.xml) file.For more guidance, refer to the articles below.

Resolve Airbridge SDK backup rules merge conflict issue

Issue

If an Airbridge SDK backup rule and a backup rule for a different third-party SDK (e.g., AppsFlyer SDK) overlap, you will see the build error below.

Attribute application@fullBackupContent value=(@xml/appsflyer_backup_rules) from [com.appsflyer:af-android-sdk:6.6.1] AndroidManifest.xml:14:18-73
is also present at [io.airbridge:sdk-android:2.14.0] AndroidManifest.xml:27:18-78 value=(@xml/airbridge_auto_backup_rules).
Suggestion: add 'tools:replace="android:fullBackupContent"' to <application> element at AndroidManifest.xml:7:5-13:19 to override.

Cause

Overlapping of the Airbridge SDK backup rules and third-party SDK backup rules can cause build errors.

Solution

`backup_rules.xml` setup

Create an Android Library project (Assets/Plugins/Android/res.androidlib) to store your resource files.
Add an AndroidManifest.xml file in the created Android Library Project as follows.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="custom.android.res"
          android:versionCode="1"
          android:versionName="1.0">
</manifest>

Create a res/xml folder inside the created Android Library Project.
Create a file (e.g., custom_backup_rules.xml) within the new xml folder.
Add the data backup rules defined by the Airbridge SDK as follows.

<?xml version="1.0" encoding="utf-8"?>
<full-backup-content>
    <!-- Airbridge Backup Rules -->
    <exclude domain="sharedpref" path="airbridge-internal" />
    <exclude domain="sharedpref" path="airbridge-install" />
    <exclude domain="sharedpref" path="airbridge-user-info" />
    <exclude domain="sharedpref" path="airbridge-user-alias" />
    <exclude domain="sharedpref" path="airbridge-user-attributes" />
    <exclude domain="sharedpref" path="airbridge-device-alias" />
    <exclude domain="database" path="airbridge.db" />

    <!-- Appsflyer Backup Rules -->
    <exclude domain="sharedpref" path="appsflyer-data"/>

    <!-- Your Custom Backup Rules -->
</full-backup-content>

`data_extraction_rules.xml` setup

Create a file (e.g., custom_data_extraction_rules.xml) within the new xml folder.
Add the data backup rules defined by the Airbridge SDK as follows.

<?xml version="1.0" encoding="utf-8"?>
<data-extraction-rules>
    <cloud-backup>
        <!-- Airbridge Backup Rules -->
        <exclude domain="sharedpref" path="airbridge-internal" />
        <exclude domain="sharedpref" path="airbridge-install" />
        <exclude domain="sharedpref" path="airbridge-user-info" />
        <exclude domain="sharedpref" path="airbridge-user-alias" />
        <exclude domain="sharedpref" path="airbridge-user-attributes" />
        <exclude domain="sharedpref" path="airbridge-device-alias" />
        <exclude domain="database" path="airbridge.db" />

        <!-- Appsflyer Backup Rules -->
        <exclude domain="sharedpref" path="appsflyer-data"/>

        <!-- Your Custom Backup Rules -->
    </cloud-backup>
    <device-transfer>
        <!-- Airbridge Backup Rules -->
        <exclude domain="sharedpref" path="airbridge-internal" />
        <exclude domain="sharedpref" path="airbridge-install" />
        <exclude domain="sharedpref" path="airbridge-user-info" />
        <exclude domain="sharedpref" path="airbridge-user-alias" />
        <exclude domain="sharedpref" path="airbridge-user-attributes" />
        <exclude domain="sharedpref" path="airbridge-device-alias" />
        <exclude domain="database" path="airbridge.db" />

        <!-- Appsflyer Backup Rules -->
        <exclude domain="sharedpref" path="appsflyer-data"/>

        <!-- Your Custom Backup Rules -->
    </device-transfer>
</data-extraction-rules>

`AndroidManifest.xml` setup

Apply the data backup rules to the Android App Manifest file (Assets/Plugins/Android/AndroidManifest.xml) as follows.

<manifest
    ...
    xmlns:tools="http://schemas.android.com/tools">

    <application
        ...
        android:allowBackup="true"
        android:fullBackupContent="@xml/custom_backup_rules"
        android:dataExtractionRules="@xml/custom_data_extraction_rules"
        tools:replace="android:fullBackupContent,android:dataExtractionRules">

For more guidance, refer to the articles below.

GAID is collected as 00000000-0000-0000-0000-000000000000

Issue

GAID is being collected as 00000000-0000-0000-0000-000000000000 even though LAT (Limited Ad Tracking) is deactivated.

Cause

The AD_ID permission has been excluded due to other third-party libraries.

Solution

Add AD_ID permission.

<manifest ...>
  ...
  <uses-permission android:name="com.google.android.gms.permission.AD_ID" />
  ...
</manifest>

Issue

When uploading your app to Google Play Console, you may receive the following warning or rejection messages:

“Your app doesn’t support 16 KB page size”
“16 KB page size compatibility required”
App upload is rejected or displayed in a warning state

This is due to Google Play policy requirements that apps targeting Android 15 (API level 35) or higher must support 16KB page size.

Cause

To support 16 KB page sizes, the entire app (APK/AAB) must be packaged with 16 KB zipalign to pass Google Play policy.If the APK/AAB is not built with 16 KB zipalign:

You will receive warning or rejection messages when uploading to Google Play Console
Uploads will be completely blocked after November 1, 2025
The app may not work properly on 16KB page size devices in the future

Known Issue in the Airbridge SDK: PT_GNU_RELRO AlignmentThe Airbridge SDK has supported 16 KB page sizes since v4.6. However, in versions built with NDK r21, the LOAD segments of the native libraries (.so) are aligned to the 16 KB boundary, but the PT_GNU_RELRO segment is not.

App behavior is not affected. The app runs normally on 16 KB page size devices.
However, Google Play Console may display a 16 KB page size warning when you upload your app.
Alignment check tools such as Android Studio lint, APK Analyzer, and check_elf_alignment.sh may also report this as a warning.

This issue was resolved by upgrading the SDK build toolchain to NDK r27, and 16 KB page size support has been verified after the fix. Refer to the table below for the minimum version with 16 KB support and the recommended version for each platform.

Platform	Minimum Version with 16 KB Support	Recommended Version (PT_GNU_RELRO issue fixed)
Android	v4.6	v4.9.4
React Native	v4.6	v4.9.0
Cordova Ionic	v4.4.1	x (support planned)
Flutter	v4.6	v4.9.0
Expo	v4.6	v4.9.0
Unity	v4.6	v4.9.2
Unreal	v4.6	v4.9.0

Solution

Step 1: Check Airbridge SDK VersionCompare the Airbridge SDK version you are using against the table above.

If you are using a version lower than the Minimum Version with 16 KB Support:

16 KB page sizes are not supported. Be sure to update.

If you are using a version at or above the Minimum Version with 16 KB Support but below the Recommended Version:

The PT_GNU_RELRO alignment issue described above may cause Google Play Console to keep showing the warning. App behavior is not affected, but to resolve the warning, update to the Recommended Version or later.Step 2: Check and Configure Android Gradle Plugin (AGP) VersionCheck your project’s current AGP version.If using AGP 8.5.1 or higher:

16KB zipalign is automatically applied without any additional configuration.
Proceed directly to Step 3.

If using AGP 8.5.0 or lower:

Option A: Upgrade AGP to 8.5.1 or higher
Option B: Keep current AGP version + Add configuration

android {
    ...
    packagingOptions {
        jniLibs {
            useLegacyPackaging true
        }
    }
}

Step 3: Rebuild and Verify the AppAfter changing the configuration, perform a clean build of your app.Step 4: Verify 16KB zipalign ApplicationVerify that the built APK/AAB is properly 16KB zipaligned.

Troubleshooting - Unity SDK

iOS

Problem

Cause

Solution

Android

Issue

Cause

Solution

Issue

Cause

Solution

Issue

Cause

Solution

Fix conflict with fullBackupContent=“string”

Fix conflict with dataExtractionRules=“string resource”

Fix conflict with allowBackup=“false”

If compileSdkVersion is lower than 31

Issue

Cause

Solution

`backup_rules.xml` setup

`data_extraction_rules.xml` setup

`AndroidManifest.xml` setup

Issue

Cause

Solution

​iOS

​Problem

​Cause

​Solution

​Android

​Issue

​Cause

​Solution

​Issue

​Cause

​Solution

​Issue

​Cause

​Solution

Fix conflict with fullBackupContent=“string”

Fix conflict with dataExtractionRules=“string resource”

Fix conflict with allowBackup=“false”

If compileSdkVersion is lower than 31

​Issue

​Cause

​Solution

backup_rules.xml setup

data_extraction_rules.xml setup

AndroidManifest.xml setup

​Issue

​Cause

​Solution

​Issue

​Cause

​Solution

iOS

Problem

Cause

Solution

Android

Issue

Cause

Solution

Issue

Cause

Solution

Issue

Cause

Solution

Issue

Cause

Solution

`backup_rules.xml` setup

`data_extraction_rules.xml` setup

`AndroidManifest.xml` setup

Issue

Cause

Solution

Issue

Cause

Solution