react native 环境搭建失败，新建一个项目，运行报错，不知道啥原因，请大侠赐教

sunck1970 2019-05-30 05:15:10

在项目中运行react-native run-android
报错信息如下

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sunck1970 2019-05-30

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报错信息 > Task :app:installDebug FAILED FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':app:installDebug'. > com.android.builder.testing.api.DeviceException: com.android.ddmlib.InstallException: Unknown failure: cmd: Can't find service: package * 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 30s 26 actionable tasks: 1 executed, 25 up-to-date 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.bat app:installDebug. Run CLI with --verbose flag for more details.