# Run time error in Android Apps

**URL:** <https://devforum.zoom.us/t/run-time-error-in-android-apps/39772>\
**Category:** Android\
**Created:** [January 5, 2021, 8:46pm UTC](https://devforum.zoom.us/t/run-time-error-in-android-apps/39772 "2021-01-05T20:46:05Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![s.b.r.y.developer](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/s.b.r.y.developer/32/18346_2.png) [@s.b.r.y.developer](https://devforum.zoom.us/u/s.b.r.y.developer)\
**Post date:** [January 5, 2021, 8:46pm UTC](https://devforum.zoom.us/t/run-time-error-in-android-apps/39772/1 "2021-01-05T20:46:05Z")

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Hello  
I try to integrate zoom sdk in my app ,but I get run time error

“Attempt to invoke interface method ‘int us.zoom.sdk.MeetingService.joinMeetingWithParams(android.content.Context, us.zoom.sdk.JoinMeetingParams, us.zoom.sdk.JoinMeetingOptions)’ on a null object reference”

I follow the documentation here

> **[Build a Zoom meeting app - Android - Client SDKs - Zoom Software Development...](https://marketplace.zoom.us/docs/sdk/native-sdks/android/build-an-app)**
>
> Build a Zoom meeting app
> 
> 
> 
> Explore the Zoom Client Android SDK by learning how to build a simple meetings app that has the following two features: 
> 
> Jo...

Can you Help Please

Thank you

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**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:** [January 5, 2021, 10:48pm UTC](https://devforum.zoom.us/t/run-time-error-in-android-apps/39772/2 "2021-01-05T22:48:39Z")

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Hi @s.b.r.y.developer, thanks for using our SDK.

Sorry to hear you are running into a crash while using our SDK. Please provide the following information so that we may better assist you:

- Version of the SDK used in your app
- The full stack trace of the crash
- A code snippet showing how you are defining the `JoinMeetingOptions` object, setting the parameters on it, and passing it into the SDK.

Thanks!

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<div class="post-metadata">

**Author:** ![s.b.r.y.developer](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/s.b.r.y.developer/32/18346_2.png) [@s.b.r.y.developer](https://devforum.zoom.us/u/s.b.r.y.developer)\
**Post date:** [January 6, 2021, 9:49pm UTC](https://devforum.zoom.us/t/run-time-error-in-android-apps/39772/3 "2021-01-06T21:49:24Z")

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Thank you jon.lieblich  
I solve it , the issue was in App Credentials,

Thank you very much for your feedback

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**Author:** ![Michael\_Condon](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/michael_condon/32/13543_2.png) [@Michael\_Condon](https://devforum.zoom.us/u/Michael_Condon)\
**Post date:** [January 14, 2021, 10:16pm UTC](https://devforum.zoom.us/t/run-time-error-in-android-apps/39772/4 "2021-01-14T22:16:56Z")

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Hey @s.b.r.y.developer,

Awesome! I am glad your issue is resolved.  
Please let us know if you have any other questions.

Thanks!  
Michael