Dear afni supporting staff members:

I am trying to execute the following command to warp a brain image from +orig to +tlrc
auto_warp.py -base TT_N27+tlrc. -input subjectdata.nii -skull_strip_input yes -warp_dxyz 2 -output_dir subject_folder


I have done the procedure with a few subjects successfully, but with one subject, i kept getting error messages (see below).
Here is the error message I received:

Warping used up maximum iterations
even after doubling number of iterations to 274.
Convergence might not have been reached.

If you find the alignment poor, try
rerunning the script with a transform
type of fewer parameters (-xform) or by using
an even higher number of iterations (-maxite).
You can also choose to continue with the
current result (dset: __ats_tmp__reg_warpdriveout+orig
by using the option: -OK_maxite

Script will stop ...

#**ERROR Failed in affine step
** ERROR - script failed

II tried to find more information and play around with auto_warp.py and 3dWarpDrive, but with no luck.

Could you please point me to a better direction to fix this problem?

Thank you very much!

Kitty