I have completed recon-all with no errors. Now I would like to use the 'asegstats2table' command but I've received the error below. I would appreciate any help in solving this problem. I am using FreeSurfer v6.0.0 on a Linux CentOS machine.

[TLA@CogmobCentOS MCI]$ asegstats2table --subjects 201.MR1 202.MR1 203.MR1 --meas volume --tablefile aseg_stats_all.txt
'import site' failed; use -v for traceback
Traceback (most recent call last):
  File "/home/TLA/Desktop/Liz/freesurfer6/bin/asegstats2table", line 4, in <module>
    import os
  File "/usr/local/lib/python2.7/os.py", line 398, in <module>
    import UserDict
  File "/usr/local/lib/python2.7/UserDict.py", line 84, in <module>
    _abcoll.MutableMapping.register(IterableUserDict)
  File "/usr/local/lib/python2.7/abc.py", line 109, in register
    if issubclass(subclass, cls):
  File "/usr/local/lib/python2.7/abc.py", line 184, in __subclasscheck__
    cls._abc_negative_cache.add(subclass)
  File "/usr/local/lib/python2.7/_weakrefset.py", line 84, in add
    self.data.add(ref(item, self._remove))
TypeError: cannot create weak reference to 'classobj' object

Thank you in advance for your help!

Liz