Error on python scan-and-livemon

[netroyano]

Hi guys i have a problem with the python scan-and-livemon when i send the command i receive the next messege 3 minutes or 4 next i send the command :

python scan-and-livemon
Locating potential GSM base station frequencies (this can take a few minutes).
Found 0 frequences
Traceback (most recent call last):
File "scan-and-livemon", line 103, in
main()
File "scan-and-livemon", line 83, in main
freqs = select_freqs(list, numreceivers)
File "scan-and-livemon", line 61, in select_freqs
s = sorted_list[0]
IndexError: list index out of range