circushttpd not work

[ekam230]

(env) ekam230@ekam230-Lenovo-U310:~/circus/env/bin$ circushttpd
Traceback (most recent call last):
File "/home/ekam230/circus/env/bin/circushttpd", line 11, in
load_entry_point('circus-web==1.0.0', 'console_scripts', 'circushttpd')()
File "/home/ekam230/circus/env/lib/python3.6/site-packages/pkg_resources/init.py", line 480, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/home/ekam230/circus/env/lib/python3.6/site-packages/pkg_resources/init.py", line 2693, in load_entry_point
return ep.load()
File "/home/ekam230/circus/env/lib/python3.6/site-packages/pkg_resources/init.py", line 2324, in load
return self.resolve()
File "/home/ekam230/circus/env/lib/python3.6/site-packages/pkg_resources/init.py", line 2330, in resolve
module = import(self.module_name, fromlist=['name'], level=0)
File "/home/ekam230/circus/env/lib/python3.6/site-packages/circusweb/circushttpd.py", line 25, in
import tornadio2
File "/home/ekam230/circus/env/lib/python3.6/site-packages/tornadio2/init.py", line 25, in
from tornadio2.router import TornadioRouter
File "/home/ekam230/circus/env/lib/python3.6/site-packages/tornadio2/router.py", line 27, in
from tornadio2 import persistent, polling, sessioncontainer, session, proto, preflight, stats
File "/home/ekam230/circus/env/lib/python3.6/site-packages/tornadio2/persistent.py", line 143
except Exception, ex:
^
SyntaxError: invalid syntax

My system:
Linux ekamLenovo-U310 4.15.0-39-generic #42-Ubuntu SMP Tue Oct 23 15:48:01 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux