Start DPARSFA from NIFTI images

To whom it may concern, I would like to start preprocessing in DPARSFA from Nifti images so I placed the images under the FunImg folder (which contains a folder for each subject). However, when I change the 'Starting Directory Name' to FunImg. I get the following warning: 'Please arrange each subject's DICOM images in one directory and then put them in FunRaw directory under the working directory' and the gui automatically revert to FunRaw (which I do not have as I want to start from nifti images). Could you please advise how to solve this problem? Thank you, Kind regards, Bianca De Blasi