我需要安装黄油刀.在哪里可以下载？我下载了一个.jar插件(但是如果该文件是我需要的那个文件),我已经安装了,但是当我点击选项“生成”时,不会出现使用butterknife的选项.接下来的一个视频教程我修改了文件Gradle build：我现在有了如下：

apply plugin: 'android-apt'

apply plugin: 'com.android.application'

android {

compileSdkVersion rootProject.ext.compileSdkVersion

buildToolsVersion rootProject.ext.buildToolsVersion

defaultConfig {

applicationId "calcursoedxleccion0.cal"

minSdkVersion rootProject.ext.minSdkVersion

targetSdkVersion rootProject.ext.targetSdkVersion

versionCode 1

versionName "1.0"

}

buildTypes {

release {

minifyEnabled false

proguardFiles getDefaultProguardFile('proguard-android.txt'),'proguard-rules.pro'

}

}

}

dependencies {

compile fileTree(dir: 'libs',include: ['*.jar'])

testCompile 'junit:junit:4.12'

compile "com.android.support:appcompat-v7:$rootProject.ext.supportLibraryVersion"

compile "com.android.support:recyclerview-v7:$rootProject.ext.supportLibraryVersion"

compile "com.android.support:support-v4:$rootProject.ext.supportLibraryVersion"

compile "com.android.support:design:$rootProject.ext.supportLibraryVersion"

// compile "com.jakewharton:butterknife:$rootProject.ext.butterKnifeVersion"

compile "com.jakewharton:butterknife:$rootProject.ext.butterKnifeVersion"

apt "com.jakewharton:butterknife-compiler:8.0.1"

}

和

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

buildscript {

repositories {

jcenter()

mavenCentral()

}

dependencies {

classpath 'com.android.tools.build:gradle:2.1.2'

classpath 'com.neenbedankt.gradle.plugins:android-apt:1.8'

// 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

}

ext{

minSdkVersion = 16

targetSdkVersion = 23

compileSdkVersion = 23

buildToolsVersion = '23.0.3'

supportLibraryVersion = '23.3.0'

butterKnifeVersion = '8.0.1'

}

Gradle来同步我得到这个错误：

“The android android-library or plugin must be applied to the project”

error (1.0)

我究竟做错了什么？