afni.nimh.nih.gov

Hello,
I was wondering if anyone can suggest a solution to this error I sometimes get...
I'm using macos lion 10.7.5...

#**ERROR Could not square a circle (3dAllineate could not align anat to epi)
Traceback (most recent call last):
File "/Users/Admin/abin/align_epi_anat.py", line 3042, in <module>
ps.align_anat2epi(e, a, ps.epi_wt, ps.AlOpt, suff, mcost)
TypeError: 'NoneType' object is not iterable

Thanks!