After following the instructions, and copying the example, I am receiving this error:

gpio-admin: could not flush data to /sys/class/gpio/export: Device or resource busy
Traceback (most recent call last):
File "gpio.py", line 4, in
with pins.pin(1, direction=In) as pin:
File "/home/pi/gpio/quick2wire-python-api/quick2wire/gpio.py", line 45, in enter
self.open()
File "/home/pi/gpio/quick2wire-python-api/quick2wire/gpio.py", line 101, in open
gpio_admin("export", self.soc_pin_number, self._pull)
File "/home/pi/gpio/quick2wire-python-api/quick2wire/gpio.py", line 16, in gpio_admin
subprocess.check_call(["gpio-admin", subcommand, str(pin)])
File "/usr/lib/python2.7/subprocess.py", line 540, in check_call
raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['gpio-admin', 'export', '18']' returned non-zero exit status 4