错误:任务“:app:processDebugResources"的执行失败.>java.io.IOException: 无法删除文件夹“"；在安卓工作室

我正在尝试使用 Android Studio 开发一个 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'
}