当我运行我的android工作室项目时，它显示以下错误

Question

  

程序类型已存在：com.google.android.gms.common.api.internal.zzbr   消息{kind = ERROR，text =已存在的程序类型：com.google.android.gms.common.api.internal.zzbr，sources = [未知源文件]，工具名称= Optional.of（D8）}

我的应用 build.gradle 代码：

apply plugin: 'com.android.application'

android {
    compileSdkVersion 27
    defaultConfig {
        applicationId "com.example.reayankarma.classattendance"
        minSdkVersion 15
        targetSdkVersion 27
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:27.1.1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.0'
    implementation 'com.android.support:support-v4:27.1.1'
    implementation 'com.android.support:design:27.1.1'
    implementation 'com.google.firebase:firebase-database:12.0.1'
   implementation 'com.google.firebase:firebase-core:12.0.1'
    implementation 'com.google.firebase:firebase-auth:12.0.1'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.firebaseui:firebase-ui-database:4.0.0'



}

apply plugin: 'com.google.gms.google-services'