Error:Execution Failed for task ':app:processDebugManifest'.
> Manifest merger Failed : Attribute Meta-data#android.support.VERSION@value value=(26.0.2) from [com.android.support:design:26.0.2] AndroidManifest.xml:28:13-35
is also present at [com.android.support:customtabs:26.0.1] AndroidManifest.xml:25:13-35 value=(26.0.1).
Suggestion: add 'tools:replace="android:value"' to <Meta-data> element at AndroidManifest.xml:26:9-28:38 to override.

这是我的应用程序：gradle文件

apply plugin: 'com.android.application'

android {
compileSdkVersion 26
buildToolsVersion "26.0.1"
defaultConfig {
    applicationId "com.shiMetaapp.shiMetacustomerapp"
    minSdkVersion 21
    targetSdkVersion 26
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    vectorDrawables.useSupportLibrary = true
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'),'proguard-rules.pro'
    }
}
}

dependencies {
compile fileTree(dir: 'libs',include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2',{
    exclude group: 'com.android.support',module: 'support-annotations'
})


compile 'com.squareup.picasso:picasso:2.5.2'
compile 'com.squareup.retrofit2:retrofit:2.3.0'
compile 'com.squareup.retrofit2:converter-gson:2.3.0'
compile 'com.synnapps:carouselview:0.1.4'
compile 'com.astuetz:pagerslidingtabstrip:1.0.1'
compile 'com.android.support:appcompat-v7:26.+'
compile 'com.android.support:design:26.+'
compile 'de.hdodenhof:circleimageview:2.1.0'
compile 'com.android.support.constraint:constraint-layout:1.0.0-alpha7'
compile 'com.android.support:cardview-v7:26.+'
compile 'com.android.support:recyclerview-v7:26.+'
compile 'com.android.support:support-v4:26.+'
compile 'com.android.support:support-vector-drawable:26.+'
//    compile 'com.facebook.android:account-kit-sdk:4.11.0'
//    compile 'com.facebook.android:facebook-android-sdk:4.11.0'// Firebase Authentication
testCompile 'junit:junit:4.12'
// Firebase Database
compile 'com.google.firebase:firebase-auth:11.0.4'
compile 'com.google.firebase:firebase-messaging:11.0.4'
compile 'com.google.firebase:firebase-config:11.0.4'
compile 'com.firebaseui:firebase-ui-auth:2.3.0'
}
apply plugin: 'com.google.gms.google-services'

这是我的清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.shiMetaapp.shiMetacustomerapp">

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.RECEIVE_SMS" />
<uses-permission android:name="android.permission.GET_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_CONTACTS" />
<uses-permission android:name="android.permission.WRITE_CONTACTS" />
<uses-permission android:name="android.permission.MANAGE_ACCOUNTS" />
<uses-permission android:name="android.permission.READ_PROFILE" />

<application
    android:name=".activity.App"
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">

    <activity
        android:name=".activity.MainActivity"
        android:theme="@style/AppTheme" />
    <activity
        android:name=".activity.ProfileActivity"
        android:theme="@style/AppTheme.NoActionBar" />
    <activity
        android:name=".activity.SettingsActivity"
        android:label="@string/title_activity_settings" />
    <activity
        android:name=".activity.SplashActivity"
        android:theme="@style/AppTheme.NoActionBar">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity android:name=".activity.Purchases" />
    <activity android:name=".activity.PhoneNumberAuthentication">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.DEFAULT"/>
        </intent-filter>
    </activity>
</application>

This是我在android工作室中设置firebase的文档.