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: 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.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/4.10.1/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 17s
383 actionable tasks: 337 executed, 46 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

react-native start
┌──────────────────────────────────────────────────────────────────────────────┐
│ │
│ Running Metro Bundler on port 8081. │
│ │
│ Keep Metro running while developing on any JS projects. Feel free to │
│ close this tab and run your own Metro instance if you prefer. │
│ │
│ https://github.com/facebook/react-native │
│ │
└──────────────────────────────────────────────────────────────────────────────┘

Looking for JS files in
D:\local\一些测试\myApp

Loading dependency graph, done.
error: bundling failed: Error: Unable to resolve module warnOnce from node_modules\react-native\Libraries\react-native\react-native-implementation.js: warnOnce could not be found within the project.

If you are sure the module exists, try these steps:

1. Clear watchman watches: watchman watch-del-all
2. Delete node_modules: rm -rf node_modules and run yarn install
3. Reset Metro's cache: yarn start --reset-cache
4. Remove the cache: rm -rf /tmp/metro-*
   at ModuleResolver.resolveDependency (C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\node-haste\DependencyGraph\ModuleResolution.js:186:15)
   at ResolutionRequest.resolveDependency (C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\node-haste\DependencyGraph\ResolutionRequest.js:52:18)
   at DependencyGraph.resolveDependency (C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\node-haste\DependencyGraph.js:282:16)
   at Object.resolve (C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\lib\transformHelpers.js:267:42)
   at C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\DeltaBundler\traverseDependencies.js:426:31
   at Array.map (<anonymous>)
   at resolveDependencies (C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\DeltaBundler\traverseDependencies.js:423:18)
   at C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\DeltaBundler\traverseDependencies.js:275:33
   at Generator.next (<anonymous>)
   at asyncGeneratorStep (C:\Users\xiao\AppData\Roaming\npm\node_modules\react-native\node_modules\metro\src\DeltaBundler\traverseDependencies.js:87:24)
   BUNDLE [ios, dev] rn_temp/index.js ░░░░░░░░░░░░░░░░ 1.2% (9/82), failed.

::ffff:127.0.0.1 - - [11/Jan/2020:18:40:15 +0000] "GET /rn_temp/index.bundle?platform=ios&dev=true HTTP/1.1" 500 - "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.117 Safari/537.36"