android studio - buildTypes cannot be applied to groovy.lang.Closure

Question

I'm getting this warning in my project gradle file:

Warning:(16, 5) 'buildTypes' cannot be applied to '(groovy.lang.Closure< com.android.build.gradle.internal.dsl.BuildType>)'

My buildTypes section is:

    buildTypes {
        debug {
            debuggable true
        }
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-project.txt'
        }
    }

I'm currently using Android Studio 1.1.0, compileSdkVersion 22, buildToolsVersion 22.0.0, and targetSdkVersion 22. I tried backing down to 21 but was still getting the warning.

What causes this warning & how is it fixed?

Answer 1

For me the problem was not solved by applying the above solution. Instead I had to go to the settings within Android Studio and select "Use gradle wrapper":

In Android Studio select: FileSettingsBuild, Execution, DeploymentBuild toolsGradle

(Mac Users: Android StudioPreferences...Build, Execution, DeploymentBuild toolsGradle )

Mark: Use default gradle wrapper (default)

This removed all 'cannot be applied to '(groovy.lang.Closure') warnings in the build files.