导入模块后，Android项目无法使用Gradle构建

我创建了一个android应用，并且想要包含vokaturi模块。我更改了vokaturi.gradle文件，"com.android.library"并":vokaturi"在settings.gradle文件和添加的主应用程序模块中添加了模块，implementation project(':vokaturi')当我尝试同步主应用程序模块时出现错误

Could not find :OpenVokaturi-Android:.
Required by:
    project :app > project :vokaturi
Search in build.gradle files  

这是我的主要app.gradle文件的外观。

    apply plugin: 'com.android.application'
    android {
        compileSdkVersion 28
    defaultConfig {
        applicationId "com.example.afinity"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    }
    dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    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 project(':vokaturi')
    }

这就是vokaturi.gradle文件的样子

apply plugin: 'com.android.library'

android {
    compileSdkVersion 28
    defaultConfig {

        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
repositories {
    flatDir {
        dirs 'libs/aars'
    }
}
dependencies {
    implementation(name: 'OpenVokaturi-Android', ext: 'aar')
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.android.support:appcompat-v7:28.0.0'
    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'
}

我不知道我做错了什么...我是android的新手，谢谢大家的帮助