Go to Tools -> SDK Manager -> Check your Android SDK Location
If you have downloaded SDK at manual path then set that path in Android SDK’s path here,
If not then check this path "C:UsersYOUR_PC_NAMEAppDataLocalAndroidSdk" (AppData is a hidden folder) This path is the default download path when we install Android Studio
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Answers
I think you don’t have SDK on your system
https://developer.android.com/studio/releases/platform-tools
You can download SDK for your windows / Linux or Mac from this android official website.
Open Android Studio
Go to Tools -> SDK Manager -> Check your Android SDK Location
If you have downloaded SDK at manual path then set that path in Android SDK’s path here,
If not then check this path "C:UsersYOUR_PC_NAMEAppDataLocalAndroidSdk" (AppData is a hidden folder) This path is the default download path when we install Android Studio