The SDK Build Tools revision (21.1.2) is too low for project ':app'. Minimum required is 25.0.0

android {
    compileSdkVersion 21
    buildToolsVersion "25.0.0"

    defaultConfig {
        applicationId "com.fanz"
        minSdkVersion 14
        targetSdkVersion 21
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
        }
    }
}