AndroidStudio1.5 can't build

[tenlee2012]

JAVA version 1.8 Android Studio 1.5 build.gradle

defaultConfig {
        applicationId "com.xxxx.handlerdemo"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        multiDexEnabled true
    }
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    testCompile 'junit:junit:4.12'
    compile 'com.android.support:multidex:1.0.1'
    compile 'com.android.support:appcompat-v7:23.1.1'
    compile 'info.hoang8f:fbutton:1.0.5'
}

the error message

Error:Execution failed for task ':app:transformClassesWithJarMergingForDebug'.
> com.android.build.api.transform.TransformException: java.util.zip.ZipException: duplicate entry: info/hoang8f/widget/FButton.class

I search on google, but can't work...... How to solve it???