CAT12 - Error using spm_vol>spm_vol_hdr

Hi all - I am trying to do some longitudinal MRI analysis for two time points using CAT12 (12.7) on SPM12 on linux and I keep running into the error shown below. I have no directory called “Volumes” so I am unsure why the script is making reference to this directory or how to change this. Is there anyone who has encountered a similar error and is able to shed some light on how to proceed?

03-Jan-2022 12:31:54 - Done ‘Run Shooting (create Templates)’
03-Jan-2022 12:31:55 - Running ‘Resize images’
03-Jan-2022 12:31:55 - Failed ‘Resize images’
Error using spm_vol>spm_vol_hdr (line 80)
File “/Volumes/WD4TBE2/MRData/202005 - LongShoot/mri/p0avg_deface_1007_v1_t1w.nii” does not exist.
In file “/data/SOFTWARE/spm12/spm_vol.m” (v5958), function “spm_vol_hdr” at line 80.
In file “/data/SOFTWARE/spm12/spm_vol.m” (v5958), function “spm_vol” at line 61.
In file “/data/SOFTWARE/spm12/toolbox/cat12/cat_vol_resize.m” (v1648), function “cat_vol_resize” at line 78.

Thanks in advance!