Error while starting servers

[RihanArfan]

I'm getting this issue while trying to start a server.
Everything is up to date and I've installed everything from requirements.txt.

Traceback (most recent call last):
  File "/usr/bin/mark2", line 3, in <module>
    from mk2.launcher import main
  File "/usr/mark2/mk2/launcher.py", line 14, in <module>
    from . import manager
  File "/usr/mark2/mk2/manager.py", line 5, in <module>
    from twisted.internet import reactor
ImportError: No module named twisted.internet