tckgen:[ERROR] Cannot use image fDLPFCL.nii.gz as RoI - im age is empty

tckgen -algo iFOD2 -cutoff 0.05 -angle 45
-minlength 20 -maxlength 1001
-seed_image fDLPFCL.nii.gz -include fpPCL.nii.gz
-seed_unidirectional
-stop dwi_wmcsd.mif fibs_MTGL-STGR.tck
tckgen: [100%] uncompressing image"fDLPFCL.nii.gz"
tckgen:[ERROR] Cannot use image fDLPFCL.nii.gz as RoI - im age is empty
How to deal with it? I am quite confused, the images are sphere with radius 8mm.