you're trying to run jackd (jack audio server) from qjackctl with its default settings, which are only legal on Linux systems.
for instance, one thing i'm pretty sure: "alsa" is NOT going to work ever on anything but Linux; maybe it works if you change driver to the proper one, "coreaudio" ?
sorry but i know nothing about Mac OSX.
you're trying to run jackd (jack audio server) from qjackctl with its default settings, which are only legal on Linux systems.
for instance, one thing i'm pretty sure: "alsa" is NOT going to work ever on anything but Linux; maybe it works if you change driver to the proper one, "coreaudio" ?
hth.
cheers