执行失败的任务'应用程序：copyDebugAndroidTestKotlinClasses' – Android的Kotlin生成错误

我试图与Kotlin建立一个两个模块项目，我遇到了这个构建错误，但我不知道如何解决它在一丝丝毫。

Error:Execution failed for task ':app:copyDebugAndroidTestKotlinClasses'. > kotlin.KotlinNullPointerException (no error message) 

我的项目build.gradle如下所示：

 buildscript { ext.compileSdkVersion = 25 ext.buildToolsVersion = "25.0.2" ext.minSdkVersion = 16 ext.targetSdkVersion = 25 ext.kotlin_version = '1.1.0' ext.supportLibVersion = '25.3.1' repositories { jcenter() } dependencies { classpath 'com.android.tools.build:gradle:2.3.1' classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version" // NOTE: Do not place your application dependencies here; they belong // in the individual module build.gradle files } } apply plugin: "kotlin" allprojects { repositories { jcenter() maven { url "https://jitpack.io" } } } 

我的应用程序模块build.gradle

 apply plugin: 'com.android.application' apply plugin: 'kotlin-android' apply plugin: 'kotlin-kapt' ext.jUnitVersion = '4.12' ext.espressoVersion = '2.2.2' android { compileSdkVersion 25 buildToolsVersion "25.0.2" defaultConfig { applicationId "com.thinkbubble.app" minSdkVersion 16 targetSdkVersion 25 versionCode 1 versionName "1.0" testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } sourceSets { main.java.srcDirs += 'src/main/kotlin' } } kapt { generateStubs = true } dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile project(path: ':bubblepicker') compile "com.android.support:appcompat-v7:$supportLibVersion" compile 'com.android.support.constraint:constraint-layout:1.0.2' compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" testCompile "junit:junit:$jUnitVersion" androidTestCompile("com.android.support.test.espresso:espresso-core:$espressoVersion", { exclude group: 'com.android.support', module: 'support-annotations' }) } 

而我的第二个模块build.gradle

 apply plugin: 'com.android.library' apply plugin: 'kotlin-android' android { compileSdkVersion rootProject.compileSdkVersion buildToolsVersion rootProject.buildToolsVersion defaultConfig { minSdkVersion 16 targetSdkVersion 25 versionCode 1 versionName "1.0" } buildTypes { release { minifyEnabled false proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' } } sourceSets { main.java.srcDirs += 'src/main/kotlin' } } dependencies { compile fileTree(dir: 'libs', include: ['*.jar']) compile "com.android.support:appcompat-v7:$supportLibVersion" compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version" compile files('libs/jbox2d-library-2.1.2.2.jar') compile files('libs/slf4j-api-1.7.22.jar') compile 'io.reactivex:rxkotlin:0.60.0' compile 'io.reactivex:rxandroid:1.2.0' compile 'io.reactivex:rxjava:1.1.6' } repositories { mavenCentral() } 

什么可能导致这个异常出现？