kotlin.jvm.KotlinReflectionNotSupportedError：运行时找不到 Kotlin 反射实现.确保你有 kotlinreflect.jar

当我编译时，我得到了上面的错误.我的gradle文件如下:-

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 23
    buildToolsVersion "24.0.0 rc2"

    defaultConfig {
        applicationId "package.name"
        minSdkVersion 16
        targetSdkVersion 23
        versionCode 6
        versionName "2.0"
    }

    buildTypes {
        debug {
            minifyEnabled false
            signingConfig signingConfigs.debug
        }
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
            signingConfig signingConfigs.release
        }
    }
    sourceSets {
        main.java.srcDirs += 'src/main/kotlin'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile "com.android.support:appcompat-v7:$support_version"
    compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
    compile "org.jetbrains.anko:anko-sdk15:$anko_version"
    compile "org.jetbrains.anko:anko-support-v4:$anko_version"
    compile "com.android.support:recyclerview-v7:$support_version"
}

buildscript {
    ext.kotlin_version = '1.0.1-2'
    repositories {
        jcenter()
        mavenCentral()
    }
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
    }
}
repositories {
    mavenCentral()
}

And my project gradle as below

buildscript {
    ext.support_version = '23.2.1'
    ext.kotlin_version = '1.0.1'
    ext.anko_version = '0.8.3'
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.1.0-alpha3'
        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
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

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

Did I miss adding anything?