The problem preventing a jobless society is the reverse: what happens to you if your personal projects are not valued by society enough to pay you for them, and therefore you can't sustain yourself from them?
Someone without the skills to create marketable projects can decide to work towards projects created by others, and be compensated for it; that's what a "job" is.
For a jobless society, you should be able to pursue your own projects without starving in case that they do not sell. These projects may involve pursuing leisure, starting charitable deeds, or taking care of your family, all without the direct beneficiaries paying for it. For this to happen, we should:
1) find a way to provide a basic livelihood for everyone in that situation (Basic Income is the most talked about); and
2) value people pursuing their own projects, more than we value people being the most productive* they can possibly be.
*(where "productive" is defined as "building stuff that people will pay for". This is the most common understanding of productivity, but I find it somewhat circular).
In essence, in order to exist, a jobless society should value you being happy more than it values you accelerating the velocity of commercial capital. This doesn't require radically new economic theories; but it requires an adjustment of the parameters by which we measure "efficiency" in what we consider an "efficient economy".