demo error

[Developer27149]

copy your basic demo code and run it:

error.

Traceback (most recent call last):
  File "b.py", line 23, in <module>
    MySpider.run()
  File "/home/qyy/anaconda3/envs/sanic/lib/python3.6/site-packages/gain/spider.py", line 52, in run
    loop.run_until_complete(cls.init_parse(semaphore))
  File "uvloop/loop.pyx", line 1451, in uvloop.loop.Loop.run_until_complete
  File "/home/qyy/anaconda3/envs/sanic/lib/python3.6/site-packages/gain/spider.py", line 71, in init_parse
    with aiohttp.ClientSession() as session:
  File "/home/qyy/anaconda3/envs/sanic/lib/python3.6/site-packages/aiohttp/client.py", line 956, in __enter__
    raise TypeError("Use async with instead")
TypeError: Use async with instead
[2019:04:08 15:05:18] Unclosed client session
client_session: <aiohttp.client.ClientSession object at 0x7fc4d2eb8e48>
sys:1: RuntimeWarning: coroutine 'Parser.task' was never awaited

and ..

from gain import Css, Item, Parser, XPathParser, Spider
ImportError: cannot import name 'XPathParser'

Thanks.