Android 无法设置未知属性'；实施'；对于类型为org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler的对象

我正在为新的AndroidKotlin项目添加新的依赖项，但在同步项目后出现以下错误

无法为类型的对象设置未知属性“实现” org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler

下面是我的build.gradle文件

apply plugin: 'com.android.application'    
apply plugin: 'kotlin-android'    
apply plugin: 'kotlin-android-extensions'    
apply plugin: 'kotlin-kapt'    
apply plugin: 'androidx.navigation.safeargs'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.samplekotlin"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    dataBinding.enabled = true
}

def lifeCycleExtensionVersion = '1.1.1'
def supportVersion = '28.0.0'
def retrofitVersion = '2.3.0'
def glideVersion = '4.9.0'
def rxJavaVersion = '2.1.1'
def roomVersion = '2.1.0-rc01'
def navVersion = '2.1.0-alpha05'
def preferencesVersion = '1.0.0'

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.core:core-ktx:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation = "com.android.support:design:$supportVersion"
    implementation = "android.arch.lifecycle:extension:$lifeCycleExtensionVersion"
    implementation =  "androidx.room:room-runtime:extension:$roomVersion"
    implementation = "androidx.legacy:legacy-support-v4:1.0.0"
    kapt "androidx.room:room-compiler:$roomVersion"
    implementation = "androidx.room:room-ktx:$roomVersion"
    implementation = "org.jetbrains.kotlinx:kotlinx-coroutine-core:1.1.1"

    implementation = "androidx.navigation:navigation-fragment-ktx:$navVersion"
    implementation = "androidx.navigation:navigation-ui-ktx:$navVersion"
    implementation = "com.google.android.material:material:1.0.0"

    implementation = "com.squareup.retrofit2:retrofit:$retrofitVersion"
    implementation = "com.squareup.retrofit2:converter-gson:$retrofitVersion"
    implementation = "com.squareup.retrofit2:adapter-rxjava2:$retrofitVersion"

    implementation = "io.reactivex.rxjava2:rxjava:$rxJavaVersion"
    implementation = "io.reactivex.rxjava2:rxandroid:$rxJavaVersion"

    implementation = "com.github.bumptech.glide:glide:$glideVersion"

    implementation = "com.android.support:palette-v7:$supportVersion"

    implementation = "androidx.preference:preference:$preferencesVersion"

    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test:runner:1.2.0'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}

---

单击“同步”按钮后，出现“实现”错误。

愚蠢的错误。发现了问题。刚刚删除=运算符

实施=