my main gradle

build.gradle

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    ext.kotlin_version = '1.2.0'
    ext.ankoVersion = "0.10.2"
    ext.daggerVersion = "2.11"
    ext.okhttpVersion = "3.9.0"
    ext.picassoVersion = "2.5.2"
    ext.priorityJobQueueVersion = "2.0.1"
    ext.mockitoVersion = "2.8.47"
    ext.retrofitVersion = "2.2.0"
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.0.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath "io.realm:realm-gradle-plugin:4.3.1"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}

allprojects {
    repositories {
        google()
        jcenter()
        mavenCentral()
        mavenLocal()
        maven { url 'https://jitpack.io'}
    }
}

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