[Android] “gradle DSL method not found: android()” 해결하기

출처: https://medium.com/@marcuspereira/solving-the-gradle-dsl-method-not-found-android-in-android-studio-6e5ab499bd3#.3nd9r9zf2

build.gradle file에서 아래

라인을 삭제 해주면 잘된다

//DELETE THIS LINES:

android {
    compileSdkVersion 21
    buildToolsVersion '21.1.2'
}