ImportError: cannot import name Publisher

[dmehar13]

mehardeep@mehardeep-VirtualBox:~$ ~/SegmEdit-master/SegmEditGUI/segmedit.py
Traceback (most recent call last):
File "/home/mehardeep/SegmEdit-master/SegmEditGUI/segmedit.py", line 24, in
from wx.lib.pubsub import Publisher as pub
ImportError: cannot import name Publisher

Though I have downloaded all packages for segmEdit but yet I am getting this error again and again .
Please someone help me. I am working on cermine and my project is getting delayed.

Thanks!