missing a Gradle plugin. Apply Gradle plugin

The build file may be missing a Gradle plugin. Apply Gradle plugin
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runProguard has been renamed to minifyEnabled in version 0.14.0 (2014/10/31) of Gradle.

To fix this, you need to change runProguard to minifyEnabled in the build.gradle file of your project. For example,
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buildTypes {
    release {
        runProguard false // Does not exist anymore...
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}
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would be replaced by :
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buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}
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