IOError in CPU Frequency Monitor: [Errno 2] No such file or directory: '/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies'

Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/awn/extras/awnlib.py", line 1580, in init_start
    applet_class(applet)
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 126, in __init__
    self.setup_context_menu()
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 191, in setup_context_menu
    self.initialize_backend(self.applet.settings["cpu_number"])
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 157, in initialize_backend
    self.setup_main_dialog()
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 213, in setup_main_dialog
    for i in self.backend.get_frequencies():
  File "/usr/share/avant-window-navigator/applets/cpufreq/cpufreq.py", line 367, in get_frequencies
    return map(int, open(os.path.join(sysfs_dir, "cpu" + str(self.__cpu_nr), "cpufreq/scaling_available_frequencies")).read().strip().split())
IOError: [Errno 2] No such file or directory: '/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies'