EffectDemo/build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    ext.kotlin_version = '1.3.20'
    repositories {
        google()
        mavenCentral()
        jcenter()
        maven { url 'https://repo1.maven.org/maven2/' }
    }
    dependencies {
        classpath "com.android.tools.build:gradle:4.0.0"
//        classpath 'com.android.tools.build:gradle:3.6.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
        maven {
            url "https://jitpack.io"
        }
        maven { url 'https://repo1.maven.org/maven2/' }
    }
}

task clean(type: Delete) {
    delete rootProject.buildDir
}