مشکل در نصب React Native

باعرض سلام و خسته نباشید خدمت جناب آقای مهندس یونس قربانی

با توجه به تدریس بسیار خوب شما نصب React Native بسیار خوب پیش رفت اما در آخرین مرحله نصب انجام نشد!

فرمان react-native run-android تقریبا همۀ ماژول ها را نصب کرده اما در نهایت پیغام خطای زیر را می دهد:

PS C:\Users\Abbas\desktop\projects\reactnative\firstproject> react-native run-android
info Running jetifier to migrate libraries to AndroidX. You can disable it using "--no-jetifier" flag.
Jetifier found 855 file(s) to forward-jetify. Using 4 workers...
info Starting JS server...
info Installing the app...

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable or by setting the sdk.dir path i
n your project's local properties file at 'C:\Users\Abbas\Desktop\Projects\ReactNative\FirstProject\android\local.proper
ties'.

* 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 4s

error Failed to install the app. Make sure you have the Android development environment set up: https://facebook.github.
io/react-native/docs/getting-started.html#android-development-environment. Run CLI with --verbose flag for more details.

Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':app'.
> SDK location not found. Define location with an ANDROID_SDK_ROOT environment variable or by setting the sdk.dir path i
n your project's local properties file at 'C:\Users\Abbas\Desktop\Projects\ReactNative\FirstProject\android\local.proper
ties'.

* 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 4s

    at checkExecSyncError (child_process.js:629:11)
    at execFileSync (child_process.js:647:13)
    at runOnAllDevices (C:\Users\Abbas\desktop\projects\reactnative\firstproject\node_modules\@react-native-community\cl
i-platform-android\build\commands\runAndroid\runOnAllDevices.js:74:39)
    at buildAndRun (C:\Users\Abbas\desktop\projects\reactnative\firstproject\node_modules\@react-native-community\cli-pl
atform-android\build\commands\runAndroid\index.js:158:41)
    at then.result (C:\Users\Abbas\desktop\projects\reactnative\firstproject\node_modules\@react-native-community\cli-pl
atform-android\build\commands\runAndroid\index.js:125:12)
    at process._tickCallback (internal/process/next_tick.js:68:7)
PS C:\Users\Abbas\desktop\projects\reactnative\firstproject>

بنده نصب را چندین بار تکرار کردم اما در آخر این خطا را میدهد... جستجو کردم علت را متوجه نشدم لطفا در صورت امکان بنده را راهنمایی فرمایید.

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