Meu projeto estava funcionando bem, quando adicionei o facebook sdk ao meu projeto, tenho um erro como esse, tentei várias maneiras de corrigir isso, mas não o fiz. O que devo fazer?

  Error:Execution failed for task ':app:packageAllDebugClassesForMultiDex'.
> java.util.zip.ZipException: duplicate entry: bolts/AggregateException.class

A classificação do meu aplicativo está abaixo

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion '21.1.2'

    defaultConfig {
        applicationId "com.example.myproject"
        minSdkVersion 9
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
        multiDexEnabled = true
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'

    compile project(':facebook')
}

E aqui está o facebook build.gradle

apply plugin: 'com.android.library'

repositories {
  mavenCentral()
}

project.group = 'com.facebook.android'

dependencies {
    compile 'com.android.support:support-v4:[21,22)'
    compile 'com.parse.bolts:bolts-android:1.1.4'
}

android {
    compileSdkVersion 21
    buildToolsVersion '21.1.2'

    defaultConfig {
        minSdkVersion 9
        targetSdkVersion 21
    }

    lintOptions {
        abortOnError false
    }

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            res.srcDirs = ['res']
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}

apply plugin: 'maven'
apply plugin: 'signing'

def isSnapshot = version.endsWith('-SNAPSHOT')
def ossrhUsername = hasProperty('NEXUS_USERNAME') ? NEXUS_USERNAME : ""
def ossrhPassword = hasProperty('NEXUS_PASSWORD') ? NEXUS_PASSWORD : ""

task setVersion {
    // The version will be derived from source
    project.version = null
    def sdkVersionFile = file('src/com/facebook/FacebookSdkVersion.java')
    sdkVersionFile.eachLine{
        def matcher = (it =~ /(?:.*BUILD = \")(.*)(?:\".*)/)
        if (matcher.matches()) {
          project.version = matcher[0][1]
          return
        }
    }
    if (project.version.is('unspecified')) {
      throw new GradleScriptException('Version could not be found.', null)
    }
}

uploadArchives {
    repositories.mavenDeployer {
        beforeDeployment { MavenDeployment deployment -> signing.signPom(deployment) }

        repository(url: "https://oss.sonatype.org/service/local/staging/deploy/maven2/") {
            authentication(userName: ossrhUsername, password: ossrhPassword)
        }

        snapshotRepository(url: "https://oss.sonatype.org/content/repositories/snapshots/") {
            authentication(userName: ossrhUsername, password: ossrhPassword)
        }

        pom.project {
            name 'Facebook-Android-SDK'
            artifactId = 'facebook-android-sdk'
            packaging 'aar'
            description 'Facebook Android SDK'
            url 'https://github.com/facebook/facebook-android-sdk'

            scm {
                connection 'scm:[email protected]:facebook/facebook-android-sdk.git'
                developerConnection 'scm:[email protected]:facebook/facebook-android-sdk.git'
                url 'https://github.com/facebook/facebook-android-sdk'
            }

            licenses {
                license {
                    name 'The Apache Software License, Version 2.0'
                    url 'https://github.com/facebook/facebook-android-sdk/blob/master/LICENSE.txt'
                    distribution 'repo'
                }
            }

            developers {
                developer {
                    id 'facebook'
                    name 'Facebook'
                }
            }
        }
    }
}

uploadArchives.dependsOn(setVersion)

signing {
    required { !isSnapshot && gradle.taskGraph.hasTask("uploadArchives") }
    sign configurations.archives
}

task androidJavadocs(type: Javadoc) {
    source = android.sourceSets.main.java.srcDirs
    classpath += project.files(android.getBootClasspath().join(File.pathSeparator))
}

task androidJavadocsJar(type: Jar, dependsOn: androidJavadocs) {
    classifier = 'javadoc'
    from androidJavadocs.destinationDir
}

task androidSourcesJar(type: Jar) {
    classifier = 'sources'
    from android.sourceSets.main.java.sourceFiles
}

artifacts {
    archives androidSourcesJar
    archives androidJavadocsJar
}

afterEvaluate {
    androidJavadocs.classpath += project.android.libraryVariants.toList().first().javaCompile.classpath
}