Not working when tethering is on

[charanrajh]

When I run the app on my device, It worked fine. After that, I have turned the USB tethering mode ON for getting my laptop connected in order to access internet. After that "react-native run-android" stopped working .Even though I turned the tethering mode OFF, It is not working.
This is the error log:

react-native run-android
JS server already running.
Building and installing the app on the device (cd android && ./gradlew installDebug)...

Configure project :app
WARNING: The specified Android SDK Build Tools version (28.0.2) is ignored, as it is below the minimum supported version (28.0.3) for Android Gradle Plugin 3.2.1.
Android SDK Build Tools 28.0.3 will be used.
To suppress this warning, remove "buildToolsVersion '28.0.2'" from your build.gradle file, as each version of the Android Gradle Plugin now has a default version of the build tools.

Task :app:installDebug FAILED
Skipping device 'MCCDU17905002875' (MCCDU17905002875): Device is null.

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:installDebug'.

com.android.builder.testing.api.DeviceException: No online devices found.

• Try:
  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
28 actionable tasks: 1 executed, 27 up-to-date
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

Command failed: ./gradlew installDebug

Error: Command failed: ./gradlew installDebug
at checkExecSyncError (child_process.js:625:11)
at Object.execFileSync (child_process.js:643:13)
at runOnAllDevices (/home/charanrajh/ToDo/node_modules/react-native/local-cli/runAndroid/runAndroid.js:299:19)
at buildAndRun (/home/charanrajh/ToDo/node_modules/react-native/local-cli/runAndroid/runAndroid.js:135:12)
at isPackagerRunning.then.result (/home/charanrajh/ToDo/node_modules/react-native/local-cli/runAndroid/runAndroid.js:65:12)
at processTicksAndRejections (internal/process/next_tick.js:81:5)

---

Also when I tried the command "adb devices", this is the log:

List of devices attached
MCCDU17905002875 no permissions (user in plugdev group; are your udev rules wrong?); see [http://developer.android.com/tools/device.html]

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