Estou recebendo esse erro sempre que tento executar um programa no Kotlin. Meus arquivos gradle são assim: Projeto Nível Gradle

buildscript {
    ext.kotlin_version = '1.2.30'
    repositories {
        google()
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.1'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
        classpath 'com.google.gms:google-services:3.2.0'
    }
}
allprojects {
    repositories {
        google()
        jcenter()
    }
}
task clean(type: Delete) {
    delete rootProject.buildDir
}

E nível do aplicativo Gradle

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'
ext.supportLibraryVersion = '27.1.1'
ext.playServices = '11.6.2'
android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.rossa.rossa"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    repositories {
        jcenter()
        maven { url 'https://jitpack.io' }
        mavenCentral()
        google()
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"
    implementation "com.android.support:appcompat-v7:$supportLibraryVersion"
    implementation 'com.android.support.constraint:constraint-layout:1.0.2'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.1'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.1'
    implementation "com.android.support:appcompat-v7:$supportLibraryVersion"
    implementation "com.android.support:design:$supportLibraryVersion"
    implementation "com.android.support:cardview-v7:$supportLibraryVersion"
    implementation 'com.jakewharton.timber:timber:4.6.1'
    implementation 'io.reactivex.rxjava2:rxandroid:2.0.1'
    implementation 'com.squareup.picasso:picasso:2.5.2'
    implementation 'com.squareup.retrofit2:retrofit:2.3.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
    implementation 'com.squareup.okhttp3:okhttp:3.9.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:3.9.0'
    implementation 'com.jakewharton.retrofit:retrofit2-rxjava2-adapter:1.0.0'
    implementation 'com.appolica:flubber:1.0.1'
    implementation 'org.greenrobot:eventbus:3.1.1'
    implementation 'com.github.daniel-stoneuk:material-about-library:2.2.3-support26.1.0'
}

Sempre que tento executar o programa, recebo este erro

Tipo de programa já presente: mensagem org.intellij.lang.annotations.Flow {kind = ERRO, texto = Tipo de programa já presente: org.intellij.lang.annotations.Flow, sources = [Arquivo de origem desconhecido], nome da ferramenta = Opcional. de (D8)}