Example导入Android studio报错，请问怎么解决？

[buqulinghun]

编辑器：as2.1.1
gradle:
`apply plugin: 'com.android.application'

android {
compileSdkVersion 14
buildToolsVersion "23.0.2"

defaultConfig {
    applicationId "com.vdisk.android.example"
    minSdkVersion 9
    targetSdkVersion 23
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
    }
}

}

dependencies {
compile project(':vDiskSdk')
compile files('libs/json_simple-1.1.jar')
compile files('libs/weibosdkcore.jar')
}报错：Error:Error converting bytecode to dex:
Cause: com.android.dex.DexException: Multiple dex files define Lorg/json/simple/ItemList; :vDiskSdk_Example:transformClassesWithDexForDebug FAILED Error:Execution failed for task ':vDiskSdk_Example:transformClassesWithDexForDebug'.

com.android.build.api.transform.TransformException: com.android.ide.common.process.ProcessException: java.util.concurrent.ExecutionException: com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_73\bin\java.exe'' finished with non-zero exit value 2`
请问怎么解决？