Cause: com.android.dex.DexException: Multiple dex files define Lorg/apache/commons/io/IOCase in Studio 3.0

Question

I am developing one project. This is working fine with Android studio 2.3.3, but what happen is when i updated my Android Studio 3.0 and open my project then it can\'t assembled

Answer 1

If you're explicitly including this dependency in your build.gradle file:

org.apache.commons:commons-io:1.3.2

replace it with this one (or a later version):

commons-io:commons-io:2.4

You may need to do a clean/rebuild to get rid of a cached version. The org.apache... named one is both misnamed and now very out-of-date. Weirdly, some other org.apache... named ones are apparently OK.