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Solution:
Go to your React-native Project
Inside android folder
Create a file named --> local.properties
Open the file
paste your Android SDK path which looks similar like below
sdk.dir = C:\\Users\\USERNAME\\AppData\\Local\\Android\\sdk --> for Windows
sdk.dir = /Users/USERNAME/Library/Android/sdk --> for macOS
sdk.dir = /home/USERNAME/Android/Sdk --> for linux
Replace USERNAME with your OS username
cd android && ./gradlew clean
cd ..
npx react-native run-android
That's it. It works!