First I'm a newbie in react-native. I start a React-native in Facebook official site react-native tutorial. When I follow the react-native android setup step by step, then I run this project When a show this message please Resolve this Error, and Suggest me. Please help me.
D:\Linux\IDE\All-Workspace\JavaScript-Workspace\React-Workshop\AwesomeProject>react-native run-androidJS server already running.Building and installing the app on the device (cd android && gradlew.bat install debug)...FAILURE: Build failed with an exception.* What went wrong:Execution failed for task ':app:installDebug'.> com.android.builder.testing.api.DeviceException: No connected devices!* 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.orgBUILD FAILED in 6s27 actionable tasks: 1 executed, 26 up-to-dateCould 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 haveset up your Android development environment:https://facebook.github.io/react-native/docs/getting-started.