When I execute mris_register to register one subject to a template., I have this message of error:

mris_register -1  s000/surf/lh.sphere  avg_all_subjects_SD/lh.reg.template.tif sphere_reg
treating target as a single subject's surface...
$Id: mris_register.c,v 1.59 2011/03/02 00:04:33 nicks Exp $
  $Id: mrisurf.c,v 1.693.2.2 2011/04/27 19:21:05 nicks Exp $
reading surface from s000_open_brain_sanlm_+TIR_normlalized/surf/lh.sphere...
MRISread(s000_open_brain_sanlm_+TIR_normlalized/surf/lh.sphere): could not open file
No such file or directory
mris_register: could not read surface file s000/surf/lh.sphere
No such file or directory