Hi, Nicole-

Hmm, I ran the following and it worked for me:

adwarp -apar FIRST_DSET+tlrc -dpar OTHER_DSET+orig -prefix OUTPUT_NAME

... so I'm not immediately sure. What is the output of

afni -ver

for you?

One possible thing to note from what is copied+pasted: those hyphens in the option names don't look like real, ASCII hyphens; I would try deleting those characters, and retyping them (this kind of badness occurs when copy+pasting from PDFs, which usually contains weird characters).

On a larger note, though, I wonder about possibly having a more modern program to perform this process... Are you purely resampling the "-dpar .." dataset to be on the grid of the "-apar .." dataset (so, only a resampling of the grids/space names), or are you trying to warp/align/move the brain the "-dpar .." dataset to align better with the "-apar .." one? Or are you doing something different with this?

--pt