Android Studio : Duplicate files error with Gradle - gradle

Question

I have an error when I want to add Robospice library; this is my build.gradle file:
apply plugin: 'android'
android {
// Check on it to know witch Android API level is necessary:
// http://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels
compileSdkVersion 19
buildToolsVersion '19.0.1'
defaultConfig {
minSdkVersion 14
targetSdkVersion 19
versionCode 1
versionName "1.0"
}
buildTypes {
release {
runProguard false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
dependencies {
compile "com.android.support:support-v4:18.0.+"
compile "com.android.support:appcompat-v7:18.0.+"
compile "com.octo.android.robospice:robospice:1.4.11"
}
But unfortunately, Gradle gives me this error:
duplicate files during packaging of APK D:\blablabla\build\apk\mtc-debug-unaligned.apk
Execution failed for task ':mtc:packageDebug'.
Duplicate files copied in APK META-INF/LICENSE.txt
File 1: C:\Users\Anthony.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-lang3\3.2.1\66f13681add50ca9e4546ffabafaaac7645db3cf\commons-lang3-3.2.1.jar
File 2: C:\Users\Anthony.gradle\caches\modules-2\files-2.1\org.apache.commons\commons-lang3\3.2.1\66f13681add50ca9e4546ffabafaaac7645db3cf\commons-lang3-3.2.1.jar
Thanks for your help !
Anthony

Answer 1

uses this code to solve your problem:
android{
packagingOptions {
exclude 'META-INF/LICENSE'
}
}
but if the problem remains, you must look for the file you need ignorie during generation of apk.and add to packagingOptions like in the code above