# Error when running it after creating the package with Proguard: No static method newSerializer()Lorg/xmlpull/v1/c;

**URL:** <https://devforum.zoom.us/t/error-when-running-it-after-creating-the-package-with-proguard-no-static-method-newserializer-lorg-xmlpull-v1-c/77045>\
**Category:** Android\
**Created:** [October 6, 2022, 4:13pm UTC](https://devforum.zoom.us/t/error-when-running-it-after-creating-the-package-with-proguard-no-static-method-newserializer-lorg-xmlpull-v1-c/77045 "2022-10-06T16:13:32Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Concilium](https://avatars.discourse-cdn.com/v4/letter/c/e0b2c6/32.png) [@Concilium](https://devforum.zoom.us/u/Concilium)\
**Post date:** [October 6, 2022, 4:13pm UTC](https://devforum.zoom.us/t/error-when-running-it-after-creating-the-package-with-proguard-no-static-method-newserializer-lorg-xmlpull-v1-c/77045/1 "2022-10-06T16:13:32Z")

</div>

Some important info: this is a plugin inside a Flutter application, with a jitsi plugin too.

I didn’t have any problems with iOS, and I don’t have any problems running the Android project with the debugger or without proguard.

The full stack:

```auto
java.lang.NoSuchMethodError: No static method newSerializer()Lorg/xmlpull/v1/c; in class Landroid/util/Xml; or its super classes (declaration of 'android.util.Xml' appears in /system/framework/framework.jar!classes3.dex)

at us.zoom.proguard.fu.n(MeetingSDKModuleService.java:1)
at com.zipow.videobox.mainboard.module.ZmSdkMainBoard.getConfigDataRawId(ZmSdkMainBoard.java:1)
at com.zipow.videobox.mainboard.module.ZmMainBoard.loadConfigData(ZmMainBoard.java:1)
at com.zipow.videobox.mainboard.module.ZmMainBoard.loadResource(ZmMainBoard.java:6)
at com.zipow.videobox.mainboard.module.ZmSdkMainBoard.loadResource(ZmSdkMainBoard.java:4)
at com.zipow.videobox.mainboard.module.ZmMainBoard.initialize(ZmMainBoard.java:7)
at com.zipow.videobox.mainboard.Mainboard.initialize(Mainboard.java:2)
at com.zipow.videobox.VideoBoxApplication.initSDKMainboard(VideoBoxApplication.java:8)
at com.zipow.videobox.VideoBoxApplication.initAppForSDK(VideoBoxApplication.java:8)
at com.zipow.videobox.VideoBoxApplication.onSDKCreated(VideoBoxApplication.java:11)
at com.zipow.videobox.VideoBoxApplication.initializeForSDK(VideoBoxApplication.java:5)
at us.zoom.sdk.ZoomSDK.initialize(ZoomSDK.java:27)
at e.f.a.a.c(FlutterZoomSdkPlugin.java:18)
at e.f.a.a.onMethodCall(FlutterZoomSdkPlugin.java:6)
at i.a.d.a.k$a.a(MethodChannel.java:2)
at io.flutter.embedding.engine.f.e.k(DartMessenger.java:2)
at io.flutter.embedding.engine.f.e.l(DartMessenger.java:2)
at io.flutter.embedding.engine.f.e.m(Unknown Source:0)
at io.flutter.embedding.engine.f.c.run(Unknown Source:12)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:247)
at android.app.ActivityThread.main(ActivityThread.java:8676)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

java.lang.NoSuchMethodError: No static method newSerializer()Lorg/xmlpull/v1/c; in class Landroid/util/Xml; or its super classes (declaration of 'android.util.Xml' appears in /system/framework/framework.jar!classes3.dex)

at us.zoom.proguard.fu.n(MeetingSDKModuleService.java:1)
at com.zipow.videobox.mainboard.module.ZmSdkMainBoard.getConfigDataRawId(ZmSdkMainBoard.java:1)
at com.zipow.videobox.mainboard.module.ZmMainBoard.loadConfigData(ZmMainBoard.java:1)
at com.zipow.videobox.mainboard.module.ZmMainBoard.loadResource(ZmMainBoard.java:6)
at com.zipow.videobox.mainboard.module.ZmSdkMainBoard.loadResource(ZmSdkMainBoard.java:4)
at com.zipow.videobox.mainboard.module.ZmMainBoard.initialize(ZmMainBoard.java:7)
at com.zipow.videobox.mainboard.Mainboard.initialize(Mainboard.java:2)
at com.zipow.videobox.VideoBoxApplication.initSDKMainboard(VideoBoxApplication.java:8)
at com.zipow.videobox.VideoBoxApplication.initAppForSDK(VideoBoxApplication.java:8)
at com.zipow.videobox.VideoBoxApplication.onSDKCreated(VideoBoxApplication.java:11)
at com.zipow.videobox.VideoBoxApplication.initializeForSDK(VideoBoxApplication.java:5)
at us.zoom.sdk.ZoomSDK.initialize(ZoomSDK.java:27)
at e.f.a.a.c(FlutterZoomSdkPlugin.java:18)
at e.f.a.a.onMethodCall(FlutterZoomSdkPlugin.java:6)
at i.a.d.a.k$a.a(MethodChannel.java:2)
at io.flutter.embedding.engine.f.e.k(DartMessenger.java:2)
at io.flutter.embedding.engine.f.e.l(DartMessenger.java:2)
at io.flutter.embedding.engine.f.e.m(Unknown Source:0)
at io.flutter.embedding.engine.f.c.run(Unknown Source:12)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:247)
at android.app.ActivityThread.main(ActivityThread.java:8676)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

```

**Which Android Meeting SDK version?**  
Android version: v5.11.10.8019 -

**To Reproduce(If applicable)**  
Steps to reproduce the behavior:

1. Simply init the sdk

I tried adding the following rules to proguard but without success:

```auto
-keep class org.kobjects.** { *; }
-keep class org.ksoap2.** { *; }
-keep class org.kxml2.** { *; }
-keep class org.xmlpull.** { *; }

-dontusemixedcaseclassnames
-dontskipnonpubliclibraryclasses
-dontoptimize
-dontpreverify

-keep class us.zoom.**{*;}
-keep class com.zipow.**{*;}
-keep class us.zipow.**{*;}
-keep class org.webrtc.**{*;}
-keep class us.google.protobuf.**{*;}
-keep class com.google.crypto.tink.**{*;}
-keep class androidx.security.crypto.**{*;}

```

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [November 6, 2022, 2:13am UTC](https://devforum.zoom.us/t/error-when-running-it-after-creating-the-package-with-proguard-no-static-method-newserializer-lorg-xmlpull-v1-c/77045/2 "2022-11-06T02:13:54Z")

</div>

Closed on November 6, 2022, 2:13am UTC

This topic was automatically closed 30 days after the last reply. New replies are no longer allowed.