任务'；的错误执行失败：app:mergeDebugResources'；在Android Studio 3.1.2中

我安装Android Studio 3.1.2并更新SDK平台、SDK工具，下载Gradle 4.4并在settimgs中启用脱机工作

我可以将Gradle与Android Studio 3.1.2同步。我还使用以下代码：

buildscript {

repositories {
    google()
    jcenter()
}
dependencies {
    classpath 'com.android.tools.build:gradle:+'
}
}
allprojects {
repositories {
    google()
    jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

这是：

apply plugin: 'com.android.application'
android {
compileSdkVersion 27
defaultConfig {
    applicationId "com.site.apptest1"
    minSdkVersion 14
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation 'com.android.support:appcompat-v7:+'
implementation 'com.android.support.constraint:constraint-layout:+'
}

但我不能建立这个项目。获取此错误：

org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:mergeDebugResources'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70)
at org.gradle.api.internal.tasks.execution.OutputDirectoryCreatingTaskExecuter.execute(OutputDirectoryCreatingTaskExecuter.java:51)
at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62)
at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54)
at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:60)
at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97)
at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87)...

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你们有并没有检查过PNG和JPG的可绘制文件夹，名称和质量可以吗？我的项目中并没有使用图像。我的项目是空的。