How to solve "method not found: 'android()'" on Android Studio?

There are two common errors when you import a proyect in Android Studio like these two:

• "Gradle DSL method not found: 'android()'" //appears on Gradle 2.x
•  "Could not find method android() for arguments" //appers on Gradle 3.x

1. It can be solved modifying two build.gradle files, first gradle file at parent should be look like:

	buildscript {
	repositories {
	jcenter()
	}
	dependencies {
	classpath 'com.android.tools.build:gradle:2.1.2'
	// NOTE: Do not place your application dependencies here; they belong
	// in the individual module build.gradle files
	}
	}
	allprojects {
	repositories {
	jcenter()
	}
	}
	task clean(type: Delete) {
	delete rootProject.buildDir
	}

view raw build.gradle hosted with ❤ by GitHub

2. And the second gradle file inside app folder should have android declaration:

	apply plugin: 'com.android.application'
	android {
	compileSdkVersion 24
	buildToolsVersion "24.0.1"
	defaultConfig {
	applicationId "org.osanchezhuerta.android.diccionarioestado"
	minSdkVersion 16
	targetSdkVersion 24
	versionCode 1
	versionName "1.0"
	}
	buildTypes {
	release {
	minifyEnabled false
	proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
	}
	}
	testOptions {
	unitTests.returnDefaultValues = true
	unitTests.all {
	// All the usual Gradle options.
	testLogging {
	events "passed", "skipped", "failed", "standardOut", "standardError"
	outputs.upToDateWhen {false}
	showStandardStreams = true
	}
	}
	}
	}
	tasks.withType(Test) {
	testLogging {
	exceptionFormat 'full'
	showCauses true
	showExceptions true
	showStackTraces true
	showStandardStreams true
	}
	}
	dependencies {
	compile fileTree(dir: 'libs', include: ['*.jar'])
	// Required -- JUnit 4 framework
	testCompile 'junit:junit:4.12'
	compile 'com.android.support:appcompat-v7:24.2.0'
	// Optional -- Mockito framework
	testCompile 'org.mockito:mockito-core:1.10.19'
	}

view raw build.gradle hosted with ❤ by GitHub

This error occurs when you have android declaration inside gradle parent file.

Best Regards,