# java.lang.ClassNotFoundException: com.zipow.cmmlib.AppUtil

**URL:** <https://devforum.zoom.us/t/java-lang-classnotfoundexception-com-zipow-cmmlib-apputil/66022>\
**Category:** Android\
**Created:** [March 18, 2022, 6:53am UTC](https://devforum.zoom.us/t/java-lang-classnotfoundexception-com-zipow-cmmlib-apputil/66022 "2022-03-18T06:53:30Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![elfaza](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/elfaza/32/33470_2.png) [@elfaza](https://devforum.zoom.us/u/elfaza)\
**Post date:** [March 18, 2022, 6:53am UTC](https://devforum.zoom.us/t/java-lang-classnotfoundexception-com-zipow-cmmlib-apputil/66022/1 "2022-03-18T06:53:31Z")

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**Description**  
My app keep crashing when run with release mode, i keep getting this error

```auto
E/AndroidRuntime(11558): java.lang.ExceptionInInitializerError
E/AndroidRuntime(11558): at com.zipow.cmmlib.AppContext.d(Unknown Source:0)
E/AndroidRuntime(11558): at us.zoom.sdk.x.k(Unknown Source:142)
E/AndroidRuntime(11558): at id.kelasdigital.lite.MainActivity.I(Unknown Source:29)
E/AndroidRuntime(11558): at id.kelasdigital.lite.MainActivity.onCreate(Unknown Source:3)
E/AndroidRuntime(11558): at android.app.Activity.performCreate(Activity.java:8198)
E/AndroidRuntime(11558): at android.app.Activity.performCreate(Activity.java:8182)
E/AndroidRuntime(11558): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1309)
E/AndroidRuntime(11558): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3773)
E/AndroidRuntime(11558): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3976)
E/AndroidRuntime(11558): at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:85)
E/AndroidRuntime(11558): at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
E/AndroidRuntime(11558): at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
E/AndroidRuntime(11558): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2315)
E/AndroidRuntime(11558): at android.os.Handler.dispatchMessage(Handler.java:106)
E/AndroidRuntime(11558): at android.os.Looper.loop(Looper.java:246)
E/AndroidRuntime(11558): at android.app.ActivityThread.main(ActivityThread.java:8544)
E/AndroidRuntime(11558): at java.lang.reflect.Method.invoke(Native Method)
E/AndroidRuntime(11558): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
E/AndroidRuntime(11558): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
E/AndroidRuntime(11558): Caused by: java.lang.ClassNotFoundException: com.zipow.cmmlib.AppUtil
E/AndroidRuntime(11558): at java.lang.Runtime.nativeLoad(Native Method)
E/AndroidRuntime(11558): at java.lang.Runtime.nativeLoad(Runtime.java:1131)
E/AndroidRuntime(11558): at java.lang.Runtime.loadLibrary0(Runtime.java:1085)
E/AndroidRuntime(11558): at java.lang.Runtime.loadLibrary0(Runtime.java:1008)
E/AndroidRuntime(11558): at java.lang.System.loadLibrary(System.java:1664)
E/AndroidRuntime(11558): at com.zipow.cmmlib.AppContext.<clinit>(Unknown Source:22)
E/AndroidRuntime(11558): ... 19 more

```

I’m not using proguard. Can you help me whats the problem?

**Which Mobile Meeting SDK version?**  
zoom-sdk-android-5.9.3.4273

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<div class="post-metadata">

**Author:** ![jon.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jon.zoom/32/13495_2.png) [@jon.zoom](https://devforum.zoom.us/u/jon.zoom)\
**Post date:** [March 21, 2022, 5:35pm UTC](https://devforum.zoom.us/t/java-lang-classnotfoundexception-com-zipow-cmmlib-apputil/66022/2 "2022-03-21T17:35:58Z")

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Hi @elfaza,

Can you please provide steps to reproduce the crash, along with any relevant code snippets?

> I’m not using proguard.

Are you 100% sure about that? Based on the stack trace, it looks like there is some obfuscation going on.

Thanks!

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**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:** [April 21, 2022, 3:36am UTC](https://devforum.zoom.us/t/java-lang-classnotfoundexception-com-zipow-cmmlib-apputil/66022/3 "2022-04-21T03:36:15Z")

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Closed on April 21, 2022, 3:36am UTC

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