问Android Studio找不到参数的方法runProguard()？

EN

/Library/Java/JavaVirtualMachines/jdk1.7.0_60.jdk/Contents/Home/bin/java "- com.intellij.rt.execution.application.AppMain org.gradle.launcher.GradleMain --build-file /Users/Tom/Documents/Git_open_sources/android-material-drawer-template/app/build.gradle

FAILURE: Build failed with an exception.

* Where:
Build file '/Users/Tom/Documents/Git_open_sources/android-material-drawer-template/app/build.gradle' line: 16

* What went wrong:
A problem occurred evaluating project ':app'.
> Could not find method runProguard() for arguments [false] on BuildType_Decorated{name=release, debuggable=false, testCoverageEnabled=false, jniDebuggable=false, pseudoLocalesEnabled=false, renderscriptDebuggable=false, renderscriptOptimLevel=3, applicationIdSuffix=null, versionNameSuffix=null, minifyEnabled=false, zipAlignEnabled=true, signingConfig=null, embedMicroApp=true, mBuildConfigFields={}, mResValues={}, mProguardFiles=[], mConsumerProguardFiles=[], mManifestPlaceholders={}}.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 6.741 secs

Process finished with exit code 1

apply plugin: 'com.android.application'

android {
compileSdkVersion 21
buildToolsVersion "21.1.0"

defaultConfig {
    applicationId "com.poliveira.apps.materialtests"
    minSdkVersion 11
    targetSdkVersion 21
    versionCode 1
    versionName "1.0"
}
buildTypes {
    release {
        runProguard false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:support-v4:21.0.0'
//noinspection GradleDependency
compile "com.android.support:appcompat-v7:21.0.0"
compile 'com.android.support:recyclerview-v7:21.0.0'
}