Can't use ofxTimeline with 0.9.0

thanks for your answers guys!

okay, i'm not realy sure what you mean by making sure TIMELINE_AUDIO_INCLUDED is undefined. Should I write

#undef TIMELINE_AUDIO_INCLUDED

instead of

#ifdef TIMELINE_AUDIO_INCLUDED
#include "ofxTLAudioTrack.h"
#endif ?

C++ noob here ...

thanks !