Error running on Rasbian stretch

[adigeo]

pi@murano:~/work/GateOne $ sudo ./run_gateone.py
[W 180807 14:46:42 locale:61] No translation found for locale: nl_NL
[W 180807 14:46:42 locale:61] No translation found for locale: nl_NL
[W 180807 14:46:42 locale:61] No translation found for locale: nl_NL
Traceback (most recent call last):
File "./run_gateone.py", line 32, in
from gateone.core.server import main
File "/home/pi/work/GateOne/gateone/core/server.py", line 402, in
from gateone.auth.authorization import require, authenticated, policies
File "/home/pi/work/GateOne/gateone/auth/authorization.py", line 38, in
@memoize
File "/home/pi/work/GateOne/gateone/core/utils.py", line 290, in init
MEMO = AutoExpireDict(timeout=timeout, interval="30s")
File "/home/pi/work/GateOne/gateone/core/utils.py", line 161, in init
self.interval = kwargs.pop('interval')
File "/home/pi/work/GateOne/gateone/core/utils.py", line 211, in interval
self._timeout_checker, value, io_loop=self.io_loop)
TypeError: init() got an unexpected keyword argument 'io_loop'
Exception AttributeError: "'AutoExpireDict' object has no attribute '_key_watcher'" in <bound method AutoExpireDict.del of {}> ignored

Looks like an incompatibility with tornado. The setup script installed tornado 5.1

[GonzRon]

pip install tornado==4.5