When building your android app with <code>npx react-native run-android</code> or <code>yarn android</code> and you encounter this build error:
<pre><code class="lang-sh">FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:validateSigningDebug'.
&gt; Keystore file '/Users/user/Documents/NobsApp/android/app/debug.keystore' not found for signing config 'debug'.
</code></pre>
To fix it, navigate through terminal to 
<pre><code class="lang-sh">yourApp/android/app
</code></pre>
and execute
<pre><code>keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000
</code></pre>Answer the questions that follow and type “y” for the last one that looks like <code>[no]:</code>. 
Finally hit enter and rebuild your project.
<blockquote>
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When building your android app with `npx react-native run-android` or `yarn android` and you encounter this build error:
```sh
FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:validateSigningDebug'.
> Keystore file '/Users/user/Documents/NobsApp/android/app/debug.keystore' not found for signing config 'debug'.
```

To fix it, navigate through terminal to 
```sh
yourApp/android/app
```
and execute

```
keytool -genkey -v -keystore debug.keystore -storepass android -alias androiddebugkey -keypass android -keyalg RSA -keysize 2048 -validity 10000
```
Answer the questions that follow and type “y” for the last one that looks like  `[no]:`. 

Finally hit enter and rebuild your project.

> If you enjoyed this article, please Like, share and drop your comments .

Follow me on twitter:  [@talk2dera](https://twitter.com/talk2dera) 

React Native: How to fix "Execution failed for task ':app:validateSigningDebug'"