Ah - thank you! Yes, I can see now that it is not the jack error making load fail at all, there is another error after that, of my own creation. I will fix that. I feel dumb, but happy you helped me see this issue I had been missing 
Ah - thank you! Yes, I can see now that it is not the jack error making load fail at all, there is another error after that, of my own creation. I will fix that. I feel dumb, but happy you helped me see this issue I had been missing