Error:Execution failed for task ':app:greendao'. Error:Execution failed for task ':app:greendao'. >

Error:Execution failed for task ':app:greendao'.
> org.eclipse.jdt.internal.compiler.impl.CompilerOptions.versionToJdkLevel(Ljava/lang/Object;)

Android Studio 的项目中build.gradle有两个，APP的build.gradle和项目工程的build.gradle. 出现上面的错误，是因为我们把配置全部写进了APP的build.gradle.

apply plugin: 'org.greenrobot.greendao'
greendao {
schemaVersion 1
daoPackage 'com.example.myapplication.greendao.gen'
targetGenDir 'src/main/java'
}

dependencies {
compile 'org.greenrobot:greendao:3.2.0'
}

buildscript {
repositories {
jcenter()
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.3.3'
classpath 'org.greenrobot:greendao-gradle-plugin:3.2.1'
}
}