Flask error

(venv)ben@ben-on-linux:~/Downloads/Flask-SocketIO-master/example$ python app.py
 * Restarting with reloader
^CKeyboardInterrupt
Traceback (most recent call last):
  File "app.py", line 81, in <module>
Traceback (most recent call last):
  File "app.py", line 81, in <module>
    socketio.run(app)
  File "/home/ben/Downloads/Flask-SocketIO-master/example/venv/local/lib/python2.7/site-packages/flask_socketio/__init__.py", line 207, in run
    socketio.run(app)
  File "/home/ben/Downloads/Flask-SocketIO-master/example/venv/local/lib/python2.7/site-packages/flask_socketio/__init__.py", line 207, in run
    run_server()
TypeError: 'NoneType' object is not callable
    run_server()
TypeError: 'NoneType' object is not callable