Can't use ofxTimeline with 0.9.0

Hi, ofxTimeline is kinda outdated. I had the same problem the other day and fixed it.
audiodecoder.h is part of the libaudiodecoder that should be included in ofxAudioDecoder but there are some issues with the project generator and it is not adding all the includes correctly. try adding ofxAudioDecoder to your project. that should work. Which os and ide are you using?