Android : Gradle DSL method not found: 'flavorGroups()'

I'm trying to create a ndk project with android studio according this tutorial and I get this error when I try to sync my gradle:

Gradle DSL method not found: 'flavorGroups()'

I'm using gradle 2.2.1, with android studio 1.0.2. Here is a part of my gradle file:

defaultConfig.versionCode = 1

flavorGroups "abi"

productFlavors {
    x86 {
        flavorGroup "abi"
        ndk {
            abiFilter "x86"
        }
        versionCode = 3
    }
    arm {
        flavorGroup "abi"
        ndk {
            abiFilter "armeabi-v7a"
        }
        versionCode = 1
    }
    mips {
        flavorGroup "abi"
        ndk {
            abiFilter "mips"
        }
        versionCode = 2
    }
    fat {
        flavorGroup "abi"
        versionCode = 0
    }
}

applicationVariants.all { variant ->
    def abiVersion = variant.productFlavors.get(1).versionCode

    variant.mergedFlavor.versionCode = abiVersion * 100000 + defaultConfig.versionCode
}

Thank you for your answers.