How can I fix this error?

[hoavutinh]

c:\Temp\mmdb-convert-master>mmdb-convert.py GeoLite2-City.mmdb > GeoIPCity.dat Traceback (most recent call last): File "C:\Temp\mmdb-convert-master\mmdb-convert.py", line 463, in metadata, thetree, = parse_mm_file(content) File "C:\Temp\mmdb-convert-master\mmdb-convert.py", line 327, in parse_mm_file tree = parse_search_tree(s[:tree_size], mm['record_size'].int_val()) File "C:\Temp\mmdb-convert-master\mmdb-convert.py", line 123, in parse_search_tree left, right = to_leftright(s[p:p+record_bytes]) File "C:\Temp\mmdb-convert-master\mmdb-convert.py", line 80, in to_int28 a, b = unpack("!LL", s + b'\x00') NameError: name 'unpack' is not defined

[meteozond]

from struct import unpack

I guess...