更新Firebase Crashlytics SDK时出现问题

我正在按照从Fabric Crashlytic迁移到Firebase Craslytic的步骤进行操作，这给了我以下问题，我收到以下错误：

我有如下build.gradle项目：

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

buildscript {
    repositories {
        jcenter()
        mavenLocal()
        google()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:4.0.0'
        classpath 'com.google.gms:google-services:4.3.3'
        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.1.1'
        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.72'
    }
}

allprojects {
    repositories {
        //mavenLocal() must be listed at the top to facilitate testing
        mavenLocal()
        jcenter()
        google()
    }
}

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

和build.gradle：应用程序如下：

buildscript {
    repositories {
        google()
    }

    dependencies {

        // Add the Google Services Gradle plugin (if it's not there already).
        classpath 'com.google.gms:google-services:4.3.3'
        // Add the Firebase Crashlytics Gradle plugin.
        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.1.1'
    }
}

apply plugin: 'com.android.application'

// Apply the Google Services plugin (if it's not there already).
apply plugin: 'com.google.gms.google-services'

// Add the Firebase Crashlytics plugin.
apply plugin: 'com.google.firebase.crashlytics'

repositories {
    maven { url 'https://s3.amazonaws.com/fabric-artifacts-private/internal-snapshots' }
}

android {
    compileSdkVersion 28
    //buildToolsVersion '27.0.3'
    defaultConfig {
        applicationId "------------"
        minSdkVersion 19
        targetSdkVersion 28
        versionCode 19
        versionName "1.0.1"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
        vectorDrawables.useSupportLibrary = true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }

    useLibrary 'org.apache.http.legacy'
    // Gradle automatically adds 'android.test.runner' as a dependency.
    useLibrary 'android.test.runner'

    useLibrary 'android.test.base'
    useLibrary 'android.test.mock'
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.google.firebase:firebase-crash:16.2.1'
    androidTestImplementation('androidx.test.espresso:espresso-core:3.1.0', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })

    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.vectordrawable:vectordrawable:1.1.0'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'com.google.firebase:firebase-messaging:20.2.0'
    implementation 'com.google.firebase:firebase-core:17.4.3'
    implementation 'com.google.firebase:firebase-auth:19.3.1'
    implementation 'com.squareup.retrofit2:retrofit:2.3.0'
    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
    implementation group: 'org.apache.httpcomponents', name: 'httpclient-android', version: '4.3.5.1'
    implementation 'androidx.recyclerview:recyclerview:1.1.0'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.szagurskii:patternedtextwatcher:0.5.0'
    testImplementation 'junit:junit:4.12'

    // Add the Firebase Crashlytics SDK.
    implementation 'com.google.firebase:firebase-crashlytics:17.0.1'

    // Recommended: Add the Google Analytics SDK.
    implementation 'com.google.firebase:firebase-analytics:17.4.3'

    implementation 'com.google.code.gson:gson:2.8.5'
}

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

我尝试添加，implementation 'com.google.code.gson: gson: 2.8.5'但无法解决，已经在互联网上搜索了，找不到更多的信息。有解决问题的建议吗？