This problem is caused by the Android attribute in the build.gradle file under project. Under normal circumstances, there are only three attributes in the build.gradle file under Project: buildscript, allprojects and dependencies (which are empty in many cases)

The contents are as follows:

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {

    repositories {
        jcenter()
    }

    //Configure gradle version
    dependencies {
        classpath 'com.android.tools.build:gradle:1.3.0'
    }
}
allprojects {
    repositories {
        jcenter()
    }
}

dependencies {
}