while running the container from image it is giving the below error/

[Mayur1995]

docker run --rm --name rotatingproxy -e "CHECK_URL=https://www.immobilienscout24.de" -e "CHECK_FOR=IS24" -e "PROXY_TIMEOUT=10.0" --privileged --net=host jgontrum/rotatingproxy
Press [CTRL+C] to stop..
Downloading Proxies
Traceback (most recent call last):
File "/scripts/gimmeproxy.py", line 102, in
test_proxy_servers()
File "/scripts/gimmeproxy.py", line 75, in test_proxy_servers
loop.run_until_complete(asyncio.wait(tasks))
File "/usr/local/lib/python3.5/asyncio/base_events.py", line 387, in run_until_complete
return future.result()
File "/usr/local/lib/python3.5/asyncio/futures.py", line 274, in result
raise self._exception
File "/usr/local/lib/python3.5/asyncio/tasks.py", line 239, in _step
result = coro.send(None)
File "/usr/local/lib/python3.5/asyncio/tasks.py", line 338, in wait
raise ValueError('Set of coroutines/Futures is empty.')
ValueError: Set of coroutines/Futures is empty.