ImportError of MACS 1.4: cannot import name opt_validate

[bigdataage]

ImportError of MACS 1.4: cannot import name opt_validate

I installed the MACS-1.4.2 by using command:

python setup.py install --prefix /share/home/licheng/liqinglab/macs


and I have added the install location to my PYTHONPATH and PATH
environment variables to /share/home/licheng/.bashrc :

export PYTHONPATH=/share/home/licheng/liqinglab/macs/lib/python2.6/site-packages:$PYTHONPATH

export PATH=/share/home/licheng/liqinglab/macs/bin:$PATH


When I run the command "macs14 --version",

I got the error:

Traceback (most recent call last):
File "/share/home/licheng/liqinglab/macs/bin/macs14", line 35, in <module>
from MACS14.OptValidator import opt_validate
ImportError: cannot import name opt_validate


I couldn't google this error , and I don't know how to deal with it.

Who can give me a solution to this?
Thank you !

[bigdataage]

The error disappeared after I reinstalled it, I don't know why.