Hi Jasmin -
In your dmrirc file , the dcmlist refers to the dicom list. You have put the BVEC/BVAL files there. That is not correct. You need to place the actual pathway to your niftis in this position.
set subjlist = (40 39 36)
# Input diffusion DICOMs (file names relative to dcmroot)
# If original DICOMs don't exist, these can be in other image format
# but then bvecfile and bvalfile must be specified
#
set dcmroot = Users/jasminalves/Desktop/data/DTI
set dcmlist = (40/DTI.nii.gz DTI.bvec DTI.bval 39/DTI.nii.gz DTI.bvec DTI.bval 36/DTI.nii.gz DTI.bvec DTI.bval)
<- Pathway to NIFTIS HERE