erreur bizarre com/googlecode/objectify/annotation/Unindexed

bonjour

je reçois cette erreur quand je lance mon Build

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Executing tasks: [:AndroidRestlet:compileJava]
 
Configuration on demand is an incubating feature.
:AndroidRestlet:compileJava FAILED
 
FAILURE: Build failed with an exception.
 
* What went wrong:
Execution failed for task ':AndroidRestlet:compileJava'.
> java.lang.NoClassDefFoundError: com/googlecode/objectify/annotation/Unindexed
 
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
 
BUILD FAILED
 
Total time: 0.287 secs

est pourtant mon gradle est le suivant

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buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.google.appengine:gradle-appengine-plugin:1.9.28'
    }
}

repositories {
    jcenter();
}

apply plugin: 'java'
apply plugin: 'war'
apply plugin: 'appengine'

sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7

dependencies {
    appengineSdk 'com.google.appengine:appengine-java-sdk:1.9.28'
   compile 'com.googlecode.objectify:objectify:5.1.13'
    compile 'javax.servlet:servlet-api:2.5'
    compile 'javax.persistence:persistence-api:1.0.2'
    compile 'com.googlecode.objectify-query:objectify-query:0.1'
    compile files('src/main/webapp/WEB-INF/libs/com.google.guava.jar')
    compile files('src/main/webapp/WEB-INF/libs/objectify-5.1.5.jar')   à l'annotation dans le jar
    compile files('src/main/webapp/WEB-INF/libs/org.codehaus.jackson.core.jar')
    compile files('src/main/webapp/WEB-INF/libs/org.codehaus.jackson.mapper.jar')
    compile files('src/main/webapp/WEB-INF/libs/org.restlet.ext.jackson.jar')
    compile files('src/main/webapp/WEB-INF/libs/org.restlet.ext.servlet.jar')
    compile files('src/main/webapp/WEB-INF/libs/org.restlet.ext.xml.jar')
    compile files('src/main/webapp/WEB-INF/libs/org.restlet.jar')
}

appengine {
  downloadSdk = true
  appcfg {
    oauth2 = true
  }
}

je ne comprend rien du tout ....

merci de votre aide

cordialement