Fatal Exception: java.lang.VerifyError

[佐藤威]

When attempting to load a network ad, the following error occurred, causing the app to crash:

Fatal Exception: java.lang.VerifyError: Rejecting class com.google.android.gms.internal.ads.oo1 that attempts to sub-type erroneous class com.google.android.gms.internal.ads.rp1 (declaration of 'com.google.android.gms.internal.ads.oo1' appears in xxxxx/base.apk) at com.google.android.gms.internal.ads.zzcdj.t(com.google.android.gms:play-services-ads@@24.1.0:1)

 
What is the root cause of this issue?

 Could it be caused by ProGuard settings?

We are using the following version:google_mobile_ads: 6.0.0

This crash does not reproduce in the test environment (an unpublished app).

 Is there a way to reproduce the issue manually?

[佐藤威]

[佐藤威]

[佐藤威]

Additional context

We are developing an app using Flutter version 3.27.4, and we are experiencing crashes on all Android devices.

This issue does not occur on iOS, but on Android, the app crashes immediately upon launch.
We’ve confirmed that the crash happens consistently across different devices and OS versions.

Please let us know how to investigate or resolve this issue.

2025年7月15日火曜日 15:56:33 UTC+9 佐藤威:

[Mobile Ads SDK Forum Advisor]

Hi,

Thank you for contacting the Mobile Ads SDK Support team.

We understand that you’re encountering a crash related to loading a network ad, specifically a java.lang.VerifyError involving Google Mobile Ads internal classes. Although this issue appears intermittent and is difficult to reproduce, we’d like to investigate it further.

To assist with debugging, could you please provide the following:

• AppID
• AdUnitId
• Ads Type
• Steps to reproduce the issue

Kindly provide the requested details via Reply privately to author option

Thanks,
 

Mobile Ads SDK Team

Feedback
How was our support today?

               
[2025-07-15 13:26:29Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01svgDl:ref" (ADR-00318927)

[佐藤威]

Thank you for your response.
Please find below the additional information you requested in the previous message.

AppID：ca-app-pub-9144530782605728~9468165635
AdUnitId①：/21845941275/and_sakuhin_320x50
AdUnitId②：/21845941275/and_sakuhin_336x280
Ads Type：Banner
Steps to reproduce the issue：
　The app crashed when the displayed ad was switched to a network ad. Additionally, there are two banner-type ads placed on the same page.

We would appreciate it if you could investigate the issue.

2025年7月15日火曜日 22:27:20 UTC+9 Mobile Ads SDK Forum Advisor:

[Mobile Ads SDK Forum Advisor]

Hi,

Thank you for providing the details.

I checked with your app ID and ad unit ID in our Google sample project. However, the ad failed to load and returned a "No fill" error.

For further investigation, could you please provide a sample project that replicates the issue.
If the file(s) you are looking to share are less than 25mb in total you can attach them to this case on your next reply. If you are having trouble attaching your file to this case or if your file(s) are larger than 25mb, you can share your files with me by performing the following steps:
1. Navigate to

https://docs.google.com/forms/d/e/1FAIpQLSfkAiXMeYP-fw1W3Z-tT9uwmATEKO5X6S-th0gR2ezdKaaqfg/viewform?usp=pp_url&entry.400550049=Mobile+Ads+SDK&entry.460850823=500Ht00001svgDlIAI&entry.80707362=00318927

2. Fill out all fields, and attach your file(s).

3. Please reply back on this thread when you have uploaded your file(s). Please do not share this link.

Thanks,
 

Mobile Ads SDK Team

Feedback
How was our support today?

               

[2025-07-16 13:48:28Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01svgDl:ref" (ADR-00318927)