Erro ao executar o comando react-native run-ios

Boa noite!

Ao executar o comando 'react-native run-ios', é gerado o erro abaixo:

PS C:\Users\Jovian\Documentos\Estudos\@Jovian\Alura\ReactNative\InstaluraMobile> react-native run-ios
Found Xcode project InstaluraMobile.xcodeproj

spawnSync xcrun ENOENT

Error: spawnSync xcrun ENOENT
    at Object.spawnSync (internal/child_process.js:982:20)
    at spawnSync (child_process.js:596:24)
    at Object.execFileSync (child_process.js:624:13)
    at Object.runIOS [as func] (C:\Users\Jovian\Documentos\Estudos\@Jovian\Alura\ReactNative\InstaluraMobile\node_modules\react-native\local-cli\runIOS\runIOS.js:76:17)
    at Promise.resolve.then (C:\Users\Jovian\Documentos\Estudos\@Jovian\Alura\ReactNative\InstaluraMobile\node_modules\react-native\local-cli\cliEntry.js:117:22)

Pesquisei na internet, mas não obtive sucesso.

Segue o 'react-native info':

PS C:\Users\Jovian\Documentos\Estudos\@Jovian\Alura\ReactNative\InstaluraMobile> react-native info

  React Native Environment Info:
    System:
      OS: Windows 10
      CPU: x64 Intel(R) Core(TM) i5-3337U CPU @ 1.80GHz
      Memory: 3.87 GB / 7.71 GB
    Binaries:
      Yarn: 1.10.1 - C:\Program Files (x86)\Yarn\bin\yarn.CMD
      npm: 6.4.1 - C:\Program Files\nodejs\npm.CMD
    IDEs:
      Android Studio: Version  3.2.0.0 AI-181.5540.7.32.5014246

Ao tentar executar com o comando pro Android 'react-native unr-android' também me gera mensagem de erro, mas, novamente, eu não consegui encontrar algo que eu possa corrigir:

PS C:\Users\Jovian\Documentos\Estudos\@Jovian\Alura\ReactNative\InstaluraMobile> react-native run-android
JS server already running.
Building and installing the app on the device (cd android && gradlew.bat installDebug)...
Starting a Gradle Daemon, 1 incompatible and 1 stopped Daemons could not be reused, use --status for details
[adb]: * daemon not running; starting now at tcp:5037
[adb]: * daemon started successfully

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

BUILD FAILED in 30s
27 actionable tasks: 1 executed, 26 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

Gostaria de verificar com vocês se já passaram por esse erro, se sabem o que pode ser, etc.

Agradeço a força!

Abraços!