I have created sample workflow diagram and also created app definitions for the same. I could not able to publish the app, when i do it throws me an error saying ''could not publish app definition please check the validity of the referenced processed models ''.
What do you see in the editor when you create your diagram and save it? Are there any errors there? I'm assuming you did create the diagram in the kickstart app editor for v6. If you're able to share any of the files by attaching that may also help.