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Error in reac native

I use Genymotion and android Studio as emulator. but when I command "react-native run-android" it show me this 2 error:
error Failed to launch emulator. Reason: No emulators found as an output of emulator -list-avds.
warn Please launch an emulator manually or connect a device. Otherwise app may fail to launch.
info Installing the app...

error Failed to install the app. Make sure you have the Android development environment set up: Run CLI with --verbose flag for more details.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

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