New Purchases UI `Class not found when unmarshalling` error

[cihadturhan]

• I have updated Purchases SDK to the latest version
• I have read the Contribution Guidelines
• I have searched the Community
• I have read docs.revenuecat.com
• I have searched for existing Github issues

Describe the bug
When I call

var result = await PaywallsPresenter.PresentIfNeeded("vip", new PaywallOptions(displayCloseButton: true));

I see Error Parcel Class not found when unmarshalling: error on Android device twice.

2025/10/25 12:02:57.705 18272 18359 Error Parcel Class not found when unmarshalling: com.revenuecat.purchasesunity.ui.PaywallUnityOptions
2025/10/25 12:02:57.705 18272 18359 Error Parcel java.lang.ClassNotFoundException: com.revenuecat.purchasesunity.ui.PaywallUnityOptions
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at java.lang.Class.classForName(Native Method)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at java.lang.Class.forName(Class.java:454)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.Parcel.readParcelableCreator(Parcel.java:3031)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.Parcel.readParcelable(Parcel.java:2981)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.Parcel.readValue(Parcel.java:2883)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.Parcel.readArrayMapInternal(Parcel.java:3261)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.BaseBundle.initializeFromParcelLocked(BaseBundle.java:292)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.BaseBundle.unparcel(BaseBundle.java:236)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.BaseBundle.getString(BaseBundle.java:1160)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at m7.tn.a(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):42)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at com.google.android.gms.measurement.internal.AppMeasurementDynamiteService.onActivityCreatedByScionActivityInfo(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):23)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at m7.jt.w(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):55)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at m7.cc.onTransact(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):21)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at android.os.Binder.transact(Binder.java:914)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzbl.zzc(com.google.android.gms:play-services-measurement-base@@23.0.0:2)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzcp.onActivityCreatedByScionActivityInfo(com.google.android.gms:play-services-measurement-base@@23.0.0:5)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzet.zza(com.google.android.gms:play-services-measurement-sdk-api@@23.0.0:8)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzeq.run(com.google.android.gms:play-services-measurement-sdk-api@@23.0.0:2)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	at java.lang.Thread.run(Thread.java:919)
2025/10/25 12:02:57.705 18272 18359 Error Parcel Caused by: java.lang.ClassNotFoundException: com.revenuecat.purchasesunity.ui.PaywallUnityOptions
2025/10/25 12:02:57.705 18272 18359 Error Parcel 	... 21 more
2025/10/25 12:02:57.705 18272 18359 Error FA Throwable caught in onActivityCreated: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: com.revenuecat.purchasesunity.ui.PaywallUnityOptions: m7.tn.a(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):42)
2025/10/25 12:02:57.731 18272 18272 Info MultiWindowDecorSupport updateCaptionType >> DecorView@4712fd7[], isFloating: false, isApplication: true, hasWindowDecorCaption: false, hasWindowControllerCallback: true
2025/10/25 12:02:57.852 18272 18359 Error Parcel Class not found when unmarshalling: com.revenuecat.purchases.ui.revenuecatui.activity.PaywallActivityArgs
2025/10/25 12:02:57.852 18272 18359 Error Parcel java.lang.ClassNotFoundException: com.revenuecat.purchases.ui.revenuecatui.activity.PaywallActivityArgs
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at java.lang.Class.classForName(Native Method)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at java.lang.Class.forName(Class.java:454)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.Parcel.readParcelableCreator(Parcel.java:3031)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.Parcel.readParcelable(Parcel.java:2981)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.Parcel.readValue(Parcel.java:2883)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.Parcel.readArrayMapInternal(Parcel.java:3261)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.BaseBundle.initializeFromParcelLocked(BaseBundle.java:292)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.BaseBundle.unparcel(BaseBundle.java:236)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.BaseBundle.getString(BaseBundle.java:1160)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at m7.tn.a(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):42)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at com.google.android.gms.measurement.internal.AppMeasurementDynamiteService.onActivityCreatedByScionActivityInfo(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):23)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at m7.jt.w(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):55)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at m7.cc.onTransact(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):21)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at android.os.Binder.transact(Binder.java:914)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzbl.zzc(com.google.android.gms:play-services-measurement-base@@23.0.0:2)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzcp.onActivityCreatedByScionActivityInfo(com.google.android.gms:play-services-measurement-base@@23.0.0:5)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzet.zza(com.google.android.gms:play-services-measurement-sdk-api@@23.0.0:8)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at com.google.android.gms.internal.measurement.zzeq.run(com.google.android.gms:play-services-measurement-sdk-api@@23.0.0:2)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	at java.lang.Thread.run(Thread.java:919)
2025/10/25 12:02:57.852 18272 18359 Error Parcel Caused by: java.lang.ClassNotFoundException: com.revenuecat.purchases.ui.revenuecatui.activity.PaywallActivityArgs
2025/10/25 12:02:57.852 18272 18359 Error Parcel 	... 21 more
2025/10/25 12:02:57.853 18272 18359 Error FA Throwable caught in onActivityCreated: android.os.BadParcelableException: ClassNotFoundException when unmarshalling: com.revenuecat.purchases.ui.revenuecatui.activity.PaywallActivityArgs: m7.tn.a(:com.google.android.gms.dynamite_measurementdynamite@254131013@25.41.31 (100400-0):42)

1. Environment
   1. Platform: Android
   2. SDK version: 8.4.0
   3. OS + version: 10
   4. Xcode/Android Studio version:
   5. Unity version: 6000.0.058f1
   6. How widespread is the issue. Percentage of devices affected. Local
2. Debug logs that reproduce the issue
3. Steps to reproduce, with a description of expected vs. actual behavior
4. Other information (e.g. stacktraces, related issues, suggestions how to fix, links for us to have context, eg. stackoverflow, etc.)

Additional context
Paywall shows fine, but the error is still thrown. I'm afraid it would affect something in production.

[RCGitBot]

👀 We've just linked this issue to our internal tracker and notified the team. Thank you for reporting, we're checking this out!

[vegaro]

@cihadturhan this is very strange. How are you installing the plugin, are you using UPM or the .unitypackage? Are you able to export the Android project and open it in Android Studio? I would love to see if the Android project is correctly resolving the RevenueCatUI.androidlib module

The fact that it works and presents the paywall but still throws that exception is very intriguing

[cihadturhan]

@cihadturhan this is very strange.

I'm not android dev, I got copilot to fix the issue. It did stuff, but nothing worked.

How are you installing the plugin, are you using UPM or the .unitypackage?

I used both (beta version first from .unitypackage, then the released stable version from UPM). Same error.

Are you able to export the Android project and open it in Android Studio? I would love to see if the Android project is correctly resolving the RevenueCatUI.androidlib module

I haven't tried it. I'm working on iOS version of the app right now so I'm not available to do it. I'll let you know when I can do it.

@vegaro I have spotted one thing. Maybe it can help resolving.
The call stack has android.gms.dynamite_measurementdynamite which appears to be an analytics library (Firebase?)
I see the error happens right after paywall is shown? Paywall is shown properly then this exception is thrown immediately.

[vegaro]

Interesting... can you share which other plugins you are using? maybe your UPM dependencies so we can try to reproduce it. It could be Firebase indeed, yeah

[cihadturhan]

Interesting... can you share which other plugins you are using? maybe your UPM dependencies so we can try to reproduce it. It could be Firebase indeed, yeah

I have firebase installed. If you'd like to try, I use analytics, crashlytics, remote config and storage libraries at version 13.4.0

I will try removing firebase in my build to see if it happens.

[builder-main]

@vegaro Hi there, we're in the same situation with a class not found exception on this exact purchasesunity.ui.PaywallUnityOptions when presenting the paywall (ending in an error 23 on the paywall on device)

We also happen to be using Firestore, but did not really considered it could be related in the issue ? Please let us know which debug info you need and how to get them. Thanks.

[builder-main]

It's an unmarshalling issue so basically it means to me that there is a class identification discrepancy on some serialized data. Like the data sent over from RC paywall server is not matching Unity SDK's resolved dependency ?

We're with unity 6.3 and RC SDK 8.4.17

[builder-main]

Probably not the issue, android studio does not resolve the dependency

[vegaro]

Interesting! In your case it looks like it didn't add RevenueCatUI.androidlib to your Android project and that's what's causing runtime errors 🤔

How are you installing the plugin? Can you share your settings.gradle? And the build.gradle of your screenshot would be interesting as well. Do you have a mainTemplate.gradle in your project?

Can you share a screenshot of the plugin in the Unity Editor? I want to see if RevenueCatUI.androidlib is there

[builder-main]

Interesting! In your case it looks like it didn't add RevenueCatUI.androidlib to your Android project and that's what's causing runtime errors 🤔

How are you installing the plugin? Can you share your settings.gradle? And the build.gradle of your screenshot would be interesting as well. Do you have a mainTemplate.gradle in your project?

Can you share a screenshot of the plugin in the Unity Editor? I want to see if RevenueCatUI.androidlib is there
Here it is

[builder-main]

@vegaro
Missed your question, this is how we installed it (through github url)
I'm trying uninstall and reinstall from UPM, but not sure it would be any different

[builder-main]

Apparently, this might have been a part of the issue, i.e. installing through the github URL vs using openUPM scoped registries.
Now we have the folder RevenueCatUI.androidlib resolving in the Android Studio project. (Or it might be that we unchecked symlink sources)

However the on device app and adb log still has the same unmarshalling exception and error 23

[builder-main]

I can confirm that a build on an emulator through android studio (now with the library present) does not have the unmarshalling issue. We still have error 23 though (which is probably due to the fact that Paywall does not work on emulators ?)