Duplicate files copied in APK META-INF/LICENSE.txt

Error:Execution failed for task ':app:packageDebug'.
> Duplicate files copied in APK META-INF/LICENSE.txt
File 1: /Users/weichunsheng/.gradle/caches/modules-2/files-2.1/commons-cli/commons-cli/1.2/2bf96b7aa8b611c177d329452af1dc933e14501c/commons-cli-1.2.jar
File 2: /Users/weichunsheng/Documents/android_app/app/libs/fastjson-1.2.6.jar

Error:Execution failed for task ':app:packageDebug'.
> Duplicate files copied in APK META-INF/NOTICE.txt
File 1: /Users/weichunsheng/.gradle/caches/modules-2/files-2.1/commons-cli/commons-cli/1.2/2bf96b7aa8b611c177d329452af1dc933e14501c/commons-cli-1.2.jar
File 2: /Users/weichunsheng/Documents/android_app/app/libs/fastjson-1.2.6.jar

android {
packagingOptions {
exclude 'META-INF/DEPENDENCIES'
exclude 'META-INF/NOTICE'
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/NOTICE.txt'
}
// ...
}