npx react-native run-android not working

Hi. I am trying to work on an open source project (https://github.com/zulip/zulip-mobile) but when I download the code and run “npx react-native run-android” I get the following error:

FAILURE: Build failed with an exception.

* What went wrong:
Task 'installDebug' not found in project ':app'.

* Try:
Run gradlew tasks to get a list of available tasks. Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
error Could not install the app on the device, read the error above for details.
Make sure you have an Android emulator running or a device connected and have
set up your Android development environment:
https://facebook.github.io/react-native/docs/getting-started.html
error Command failed: ./gradlew app:installDebug. Run CLI with --verbose flag for more details.

I am trying to run on android virtual device. Here is my “npx react-native info” command output:

info 
  React Native Environment Info:
    System:
      OS: macOS 10.15.4
      CPU: (8) x64 Intel(R) Core(TM) i5-8259U CPU @ 2.30GHz
      Memory: 37.67 MB / 8.00 GB
      Shell: 3.2.57 - /bin/bash
    Binaries:
      Node: 10.16.3 - /usr/local/bin/node
      Yarn: 1.16.0 - /usr/local/bin/yarn
      npm: 6.14.3 - /usr/local/bin/npm
      Watchman: 4.9.0 - /usr/local/bin/watchman
    SDKs:
      iOS SDK:
        Platforms: iOS 13.4, DriverKit 19.0, macOS 10.15, tvOS 13.4, watchOS 6.2
    IDEs:
      Android Studio: 3.6 AI-192.7142.36.36.6308749
      Xcode: 11.4/11E146 - /usr/bin/xcodebuild
    npmPackages:
      react: 16.8.3 => 16.8.3 
      react-native: 0.59.10 => 0.59.10 
    npmGlobalPackages:
      create-react-native-app: 2.0.2
      react-native-cli: 2.0.1
      react-native: 0.61.5

Thanks for your help!