1My app kept crashing because I had changed the name of the app in a few places. 
2Make sure your app name is the same everywhere. Check if the folder name in
3
4  android/app/src/main/java/com/<appname>/MainActivity.java
5  android/app/src/main/java/com/<appname>/MainApplication.java
6
7has the same name as that of your app in manifest file in
8
9	android/app/src/main/AndroidManifest.xml
10  
11  
12##### Another solution ########
131. clean your build 
14cd android ./gradlew clean
15
162. Try bundling 
17./gradlew bundleRelease
18
193. Exit android folder 
20cd ../
21
224. Try running 
23npx react-native run-android --variant=release 

1For those who still have a similar issue,
2the key is to replace every use of View.propTypes.style with ViewPropTypes.style
3(and make sure that you include a : 
4import { ViewPropTypes } from 'react-native';
5at the top of the file).