error when running it

error

/usr/local/bin/python3.6 /home/python/pycharm-community-2017.1.1/helpers/pydev/pydevd.py --multiproc --qt-support --client 127.0.0.1 --port 35643 --file /home/python/PycharmProjects/Sanic-Server-with-MDL-Blog-Template/main.py
Connected to pydev debugger (build 171.4163.6)
pydev debugger: process 14333 is connecting

2017-04-27 17:53:33,957: DEBUG: 
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      ▄▄▄▄▄  █████████▄  /                 \
     ▀▀▀▀█████▌ ▀▐▄ ▀▐█ |   Gotta go fast!  |
   ▀▀█████▄▄ ▀██████▄██ | _________________/
   ▀▄▄▄▄▄  ▀▀█▄▀█════█▀ |/
        ▀▀▀▄  ▀▀███ ▀       ▄▄
     ▄███▀▀██▄████████▄ ▄▀▀▀▀▀▀█▌
   ██▀▄▄▄██▀▄███▀ ▀▀████      ▄██
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▀▄▄▄▄▀   ▀▀████▒▒▒▒▄██▀
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2017-04-27 17:53:33,957: INFO: Goin' Fast @ http://127.0.0.1:8000
2017-04-27 17:53:33,963: INFO: Starting worker [14333]
2017-04-27 17:53:38,145: ERROR: Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 448, in handle_request
    response = await self._run_request_middleware(request)
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 612, in _run_request_middleware
    response = await response
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic_wtf/__init__.py", line 99, in setup_csrf_context
    Meta.csrf_context = self.get_csrf_context(request)
KeyError: 'session'

2017-04-27 17:53:38,145: ERROR: Exception occurred while handling uri: "http://127.0.0.1:8000/login"
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 448, in handle_request
    response = await self._run_request_middleware(request)
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 612, in _run_request_middleware
    response = await response
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic_wtf/__init__.py", line 99, in setup_csrf_context
    Meta.csrf_context = self.get_csrf_context(request)
KeyError: 'session'

2017-04-27 17:53:38,174: ERROR: Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 448, in handle_request
    response = await self._run_request_middleware(request)
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 612, in _run_request_middleware
    response = await response
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic_wtf/__init__.py", line 99, in setup_csrf_context
    Meta.csrf_context = self.get_csrf_context(request)
KeyError: 'session'

2017-04-27 17:53:38,174: ERROR: Exception occurred while handling uri: "http://127.0.0.1:8000/favicon.ico"
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 448, in handle_request
    response = await self._run_request_middleware(request)
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic/app.py", line 612, in _run_request_middleware
    response = await response
  File "/usr/local/lib/python3.6/asyncio/coroutines.py", line 109, in __next__
    return self.gen.send(None)
  File "/usr/local/lib/python3.6/site-packages/sanic_wtf/__init__.py", line 99, in setup_csrf_context
    Meta.csrf_context = self.get_csrf_context(request)
KeyError: 'session'