Failed to find target with hash string '27.0.3' Android Studio 3.1.3

Question

After updating android studio I am facing Failed to find target with hash string '27.0.3' in: /Users/duggu/Library/Android/sdk.

Gradle

SDK Manager

SDK Platforms

SDK Tools

SDK folder look like below

I tried so many links but didn't not achieve my goal yet :-

failed to find target with hash string android-23

Cause: failed to find target with hash string 'android-N'

Cause: failed to find target with hash string 'N'

Cause: failed to find target with hash string 'android-N'

Answer 1

My mistake is as follows

compileSdkVersion rootProject.ext.buildToolsVersion
buildToolsVersion rootProject.ext.buildToolsVersion

This is a Copy caused error， Correct as follows

compileSdkVersion rootProject.ext.compileSdkVersion
buildToolsVersion rootProject.ext.buildToolsVersion

The compileSdk version is the android version, not the buildtools version.