在根项目中找不到任务'gradle'

Question

我构建自动化脚本离子gradle我的build.gradle文件

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'maven'
sourceCompatibility = 1.7
version = '1.0'
jar {
manifest {
    attributes 'Implementation-Title': 'RESTAPIClientAutomation', 'Implementation-Version':    
Version
}
}
repositories {
mavenLocal()
mavenCentral()
}
task wrapper(type: Wrapper) {
  description = 'Install Gradle wrapper'
  gradleVersion = '1.10'
}
dependencies {      
compile 'org.apache.poi:poi:3.5-beta5'
testCompile  'org.testng:testng:6.8.5'
compile 'org.seleniumhq.selenium:selenium-server:2.39.0'   
compile 'log4j:log4j:1.2.17'
compile 'com.googlecode.json-simple:json-simple:1.1'
compile 'net.sf.json-lib:json-lib:2.4:jdk15'   
}

sourceSets {
unitTest {
    java.srcDir file('src/test/java')
    resources.srcDir file('src/test/resources')
}
  }
test {
useTestNG() {
useDefaultListeners = true
ignoreFailures = true
options.suites("src/test/resources/testng.xml")
options {
    listeners << 'org.uncommons.reportng.HTMLReporter'
    listeners << 'org.uncommons.reportng.JUnitXMLReporter'
  }
 }
 }
 uploadArchives {
 repositories {
   flatDir {
       dirs 'repos'
   }
 }
 }

执行build.gradle时抛出错误

FAILURE: Build failed with an exception.\
 * What went wrong:
 Task 'gradle' not found in root project 'RESTAPIClient-Gradle'.

 * Try:
 Run gradle tasks to get a list of available tasks. Run with --stacktrace option to get the stack   
 trace. Run with --info or --debug option to get more log output.   

  BUILD FAILED

  Total time: 0.126 secs
  [sts] Build failed
   org.gradle.tooling.BuildException: Could not execute build using Gradle distribution
   'http://services.gradle.org/distributions/gradle-1.10-bin.zip'.at    org.gradle.tooling.internal.consumer.ResultHandlerAdapter.onFailure(ResultHandlerAdapter.java:53)
at org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(DefaultAsyncConsumerActionExecutor.java:57)
at       org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:64)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

我的文件夹结构

src / main / java - 默认类文件 src / main / resource-default文件 src / test / java-所有类文件都可用

任何人都可以为此解释一下吗？