Gradle error - Execution failed for task ':app:dexDebug'

Question

I am trying to add the MPAndroidChartLibrary to my Android Studio project, however when I try to run the app, it keeps failing with 1 error. I am not very good with gradle,

Answer 1

MPAndroidChart already has com.nineoldandroids:library:2.4.+ as a dependency. Remove compile 'com.nineoldandroids:library:2.4.0' from your dependencies.