AttributeError: module 'asyncio' has no attribute 'create_task'

[rdek]

/> git clone https://github.com/zpettry/boxer
/> cd boxer
/> pip3 install -r requirements.txt --user
/> pyton3 boxer.py -u https://www.mysite.com -w common
______
| ___
| |/ / _____ _____ _ __
| ___ / _ \ / / _ \ '__|
| |/ / () > < / |
_/ _/_/__|_|

 Directory Bruteforcer

             Zack Pettry

Starting bruteforce on https://www.mysite.com for response code(s) [200, 204, 301, 302, 307, 403]...

Traceback (most recent call last):
File "boxer.py", line 200, in
main(**vars(args))
File "boxer.py", line 60, in main
url, extension, word_list, database, timeout, response_codes
File "/opt/boxer/classes.py", line 139, in start_bruteforce
self.run_quickly(url, extension, word_list, database, timeout)
File "/usr/lib/python3.6/asyncio/base_events.py", line 473, in run_until_complete
return future.result()
File "/opt/boxer/classes.py", line 60, in run_quickly
task = asyncio.create_task(
AttributeError: module 'asyncio' has no attribute 'create_task'