ValueError: range() step argument must not be zero

[ewaters99]

I keep getting the following error:

Traceback (most recent call last):
File "c:\temp\goatrider.py", line 388, in main
ip_list, host_list = parse_ip_file( fileinput )
File "c:\temp\goatrider.py", line 364, in parse_ip_file
for index in range( 0, len_cl, max_lines):
ValueError: range() step argument must not be zero
Total execution time (0.85000)