错误：任务'：app：processDebugResources'的执行失败。 > java.io.IOException：无法删除文件夹“"在android工作室

我正在尝试使用Android Studio开发Android应用程序，
所以我创建了一个Android应用程序，我想发布它。
每当我点击build project获取apk文件时，
我收到此错误：

I am trying to develop a Android application using Android Studio, so I created an Android app and I want to publish it. Whenever I click on "build project" to obtain the apk file, I get this error:

Error:Execution failed for task ':app:processDebugResources'.
> java.io.IOException: Could not delete folder C:\Users\ehsan\AndroidStudioProjects\MyApplication3\app\build\generated\source\r\debug\com\example\ehsan

Build.gradle：

Build.gradle:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.2"

    defaultConfig {
        applicationId "com.example.ehsan.myapplication"
        minSdkVersion 15
        targetSdkVersion 23
        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-v7:23.2.0'
}