Errors with UnityAds

[cabronious]

I have successfully used UnityAds in a test application and also this particular game. However, once I created a release version of the game, the UnityAds seem too fail. Switching back to a debug release for some reason also did not work. Any idea what could be causing the errors below?

I am getting the following errors in my logcat:

2021-01-03 20:43:58.357 4168-4332/? E/UnityAds: com.unity3d.services.core.webview.bridge.b.a() (line:55) :: Error handling invocation com.unity3d.services.core.api.Sdk.loadComplete([]): null

2021-01-03 20:44:57.134 4168-4258/? E/UnityAds: com.unity3d.services.core.c.g$d.a() (line:344) :: Unity Ads WebApp creation failed!

2021-01-03 20:44:57.135 4168-4258/? E/UnityAds: com.unity3d.services.core.c.g$e.a() (line:383) :: Unity Ads init: halting init in create webapp: Creation of WebApp failed!

[htlxyz]

If you can’t load advertisements only in publishing mode, it may be that unityads has no advertisements to display

[cabronious]

I was e-mailed by someone from Unity that there was an issue with my proguard rules as below.

I’ve tested both builds and looks like you have an issue with the Proguard.
You can see in the documentation, that Proguard only works with Release builds (i.e cocos run -m release) debug builds do not invoke Proguard rules, that’s why your debug build is working properly.

I was advised to put the following lines in the Proguard.

# Keep filenames and line numbers for stack traces
-keepattributes SourceFile,LineNumberTable
# Keep JavascriptInterface for WebView bridge
-keepattributes JavascriptInterface
# Sometimes keepattributes is not enough to keep annotations
-keep class android.webkit.JavascriptInterface {
;
}
# Keep all classes in Unity Ads package
-keep class com.unity3d.ads.* {

• ;
  }
  # Keep all classes in Unity Services package
  -keep class com.unity3d.services.* {
• ;
  }
  -dontwarn com.google.ar.core.*

The line with -keep class com.unity3d.services.** seems to give me problems and I am getting the following error:

Execution failed for task ‘:game:transformClassesAndResourcesWithProguardForReleaseFeature’.

Job failed, see logs for details

Do you have any advice for this error?

[cabronious]

By the way, I put these lines in the proguard-rules.pro files under the Gradle Scripts.