[Twisted-Python] exceptions.ImportError: cannot import name _epoll

[8]

My dear friends,   would u please give your hand kindly?

the twisted version is 12.3.0.‍
the detail error is as below:
Unhandled Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/twisted/application/app.py", line 652, in run
    runApp(config)
  File "/usr/lib/python2.7/site-packages/twisted/scripts/twistd.py", line 23, in runApp
    _SomeApplicationRunner(config).run()
  File "/usr/lib/python2.7/site-packages/twisted/application/app.py", line 386, in run
    self.application = self.createOrGetApplication()
  File "/usr/lib/python2.7/site-packages/twisted/application/app.py", line 451, in createOrGetApplication
    application = getApplication(self.config, passphrase)
--- <exception caught here> ---
  File "/usr/lib/python2.7/site-packages/twisted/application/app.py", line 462, in getApplication
    application = service.loadApplication(filename, style, passphrase)
  File "/usr/lib/python2.7/site-packages/twisted/application/service.py", line 405, in loadApplication
    application = sob.loadValueFromFile(filename, 'application', passphrase)
  File "/usr/lib/python2.7/site-packages/twisted/persisted/sob.py", line 210, in loadValueFromFile
    exec fileObj in d, d
  File "src/try.tac", line 32, in <module>
    from twisted.internet import epollreactor
  File "/usr/lib/python2.7/site-packages/twisted/internet/epollreactor.py", line 31, in <module>
    from twisted.python import _epoll
exceptions.ImportError: cannot import name _epoll


Failed to load application: cannot import name _epoll‍









Thanks a lot,
Mark
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