Crashing on Release Build (Android)

[CmerCy132]

I'm getting this error whenever I try to open the wikitude AR world in Release version of the app.

12-18 11:13:58.107 20994-20994/com.nationalgallerysingapore.galleryexplorer A/zygote: java_vm_ext.cc:534] JNI DETECTED ERROR IN APPLICATION: JNI GetJavaVM called with pending exception java.lang.NoSuchFieldError: no "J" field "nativePtr" in class "Lcom/wikitude/architect/util/internal/ArchitectSDKBuildInformationInternal;" or its superclasses java_vm_ext.cc:534] at void com.wikitude.architect.util.internal.ArchitectSDKBuildInformationInternal.createNative() ((null):-2)

12-18 11:13:58.108 20994-20994/com.nationalgallerysingapore.galleryexplorer A/zygote: java_vm_ext.cc:534] at void com.wikitude.architect.util.internal.ArchitectSDKBuildInformationInternal.<init>() ((null):-1) java_vm_ext.cc:534] at void com.wikitude.architect.ArchitectView.<clinit>() ((null):-1) java_vm_ext.cc:534] at com.wikitude.common.e.a com.wikitude.architect.ArchitectView.getPermissionManager() ((null):-1) java_vm_ext.cc:534] at void com.brave.wikitudebridge.WikitudePrecheck.onCreate(android.os.Bundle) ((null):-1) java_vm_ext.cc:534] at void android.app.Activity.performCreate(android.os.Bundle, android.os.PersistableBundle) (Activity.java:7009) java_vm_ext.cc:534] at void android.app.Activity.performCreate(android.os.Bundle) (Activity.java:7000) java_vm_ext.cc:534] at void android.app.Instrumentation.callActivityOnCreate(android.app.Activity, android.os.Bundle) (Instrumentation.java:1214) java_vm_ext.cc:534] at android.app.Activity android.app.ActivityThread.performLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent) (ActivityThread.java:2731) java_vm_ext.cc:534] at void android.app.ActivityThread.handleLaunchActivity(android.app.ActivityThread$ActivityClientRecord, android.content.Intent, java.lang.String) (ActivityThread.java:2856)

[MendicantBias90]

From a non-java developer, after digging for hours in wikitude, android and java issues I randomly found a solution. In your app build.gradle, if your release buildType has minifyEnabled set to true, it seems that proguard obfuscates wikitude classes. To avoid this, add

-keep class com.wikitude.architect.** {*;}
-keep class com.wikitude.common.** {*;}

to your proguard-rules.pro