jayway/maven-android-plugin — comment on commit ee807a227a95827d1684f968bd90bab049a54ceb
File:  line 0
By johanlindquist:

Hmm, seems to not clean out the obj directory correctly for 'mixed' projects (project is of type apk but also contains native code), will fix that. In any case, I removed the obj manually and it builds fine for me.

Hugo/Manfred, could you remove the obj folder manually and re-run a build?