Whle running my react native code react-native run-android getting below error. It was working proper. But after taking fresh pull from git and npm ci and after I am running then getting this error.

error Failed to install the app. Make sure you have the Android development environment set up: https://reactnative.dev/docs/environment-setup.
Error: Command failed: gradlew.bat app:installDebug -PreactNativeDevServerPort=8081

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:checkDebugAarMetadata'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckAarMetadataWorkAction
   > The minCompileSdk (30) specified in a
     dependency's AAR metadata (META-INF/com/android/build/gradle/aar-metadata.properties)
     is greater than this module's compileSdkVersion (android-29).
     Dependency: androidx.core:core:1.7.0-alpha01.
     AAR metadata file: C:\Users\gauraab\.gradle\caches\transforms-2\files-2.1\9e02d64f5889006a671d0a7165c73e72\core-1.7.0-alpha01\META-INF\com\android\build\gradle\aar-metadata.properties.

As some has mentioned, the problem is that the RN build automatically "upgraded" to androidx.core:core:1.7.0-alpha01, which depends on SDK version 30.

The Fix

The fix is simply to specify android core version via androidXCore in build.gradle

buildscript {
    ext {
        buildToolsVersion = "29.0.3"
        minSdkVersion = 23
        compileSdkVersion = 29
        targetSdkVersion = 29
        ndkVersion = "20.1.5948944"
        kotlin_version = "1.5.0"
        androidXCore = "1.5.0"
    }

How I figured it out

Figuring this out was painful. I grepped for gradle files that would automatically upgrade packages like so

find . -name '*.gradle' -exec grep -H "\.+" {} \;

and found in node_modules/@react-native-community/netinfo/android/build.gradle the following snippet

def androidXCore = getExtOrInitialValue('androidXCore', null)
  if (supportLibVersion && androidXVersion == null && androidXCore == null) {
    implementation "com.android.support:appcompat-v7:$supportLibVersion"
  } else {
    def defaultAndroidXVersion = "1.+"
    if (androidXCore == null) {
      androidXCore = androidXVersion == null ? defaultAndroidXVersion : androidXVersion
    }
    implementation "androidx.core:core:$androidXCore"
  }
}

Apparently they just broke this today.

You can fix it by adding the following line to your app level build.gradle file (above the android { } block as a sibling):

configurations.all {
    resolutionStrategy { force 'androidx.core:core-ktx:1.6.0' }
}

Finally, the Gradle build was successfully completed. Ref. https://docs.gradle.org/current/dsl/org.gradle.api.artifacts.ResolutionStrategy.html