Download.py ERROR !!! HELPME

[thunyapk50]

D:\googleplay-api-master\googleplay-api-master>python download.py com.google.android.gm
C:\Python27\lib\site-packages\urllib3\connectionpool.py:847: InsecureRequestWarning: Unverified HTTPS request is being made. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#ssl-warnings
InsecureRequestWarning)
Traceback (most recent call last):
File "download.py", line 35, in
ot = doc.offer[0].offerType
File "C:\Python27\lib\site-packages\google\protobuf\internal\containers.py", line 204, in getitem
return self._values[key]
IndexError: list index out of range