java - Android Error Regarding MultiDex -

i'm getting following error when build application in android:

error:execution failed task ':app:packagealldebugclassesformultidex'. java.util.zip.zipexception: duplicate entry: oauth/signpost/http/httpresponse.class

my build.gradle looks this:

apply plugin: 'com.android.application'  android {     compilesdkversion 22     buildtoolsversion "22.0.1"      defaultconfig {         applicationid "com.example.me.hey"         minsdkversion 8         targetsdkversion 22         versioncode 1         versionname "1.0"         multidexenabled = true     }     buildtypes {         release {             minifyenabled false             proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         }     } }  dependencies {     compile filetree(include: ['*.jar'], dir: 'libs')     compile 'com.android.support:appcompat-v7:22.2.0'     compile 'com.semantics3:sem3java:1.2.2'     compile files('libs/sem3java-1.2.2-jar-with-dependencies.jar')     compile 'com.android.support:multidex:1.0.0' } 

any ideas on might doing wrong?