任务“：YamstestApp：PredexDebug”执行失败

Question

任务:YamstestApp:PredexDebug执行失败。

com.android.ide.common.internal.loggederrorexception：无法运行命令:c:\programfiles(x86)\android\androidstudio\sdk\build-tools\android-4.4.2\dx.bat--dex--outputprocessArchive（classpathOpener.java:244)位于com.android.dx.cf.direct.classpathOpener.processOne（classpathOpener.java:166)位于com.android.dx.cf.direct.classpathOpener.process（classpathOpener.java:144)位于com.android.dx.command.dexer.main.processOne（classpathOpener.java:596)位于com.android.dx.command.dexer.main.processOne（main.java:596)位于正在中止

下面是build.gradle文件

import groovy.io.FileType

buildscript {
   repositories {
    mavenCentral()
   }
 dependencies {
    classpath 'com.android.tools.build:gradle:0.7.+'
           }
}

apply plugin: 'android'

repositories {
    mavenCentral()
} 

android {
compileSdkVersion 19
buildToolsVersion "19.0.1"

defaultConfig {
    minSdkVersion 17
    targetSdkVersion 19
   }

 }


dependencies {
compile 'com.android.support:appcompat-v7:+'
}

preBuild.doFirst {

def protoc = file('../../../AppUtilities/bin/protoc.exe')
def outdir = file('src/main/java')
//outdir.deleteDir()
//outdir.mkdir()

file('../../../Libraries/YAMSLib').eachFileMatch (FileType.FILES, ~/.*\.proto/) { file ->
    exec {
        println 'generating java for '+file.name
        commandLine protoc.absolutePath, '"--java_out='+outdir.absolutePath+'"',    file.absolutePath, '"--proto_path='+file.getParentFile().absolutePath+'"'
    }
}

}