Tckgen error

Dear MRtrix3 experts,

I need to generate a whole brain tractography using tckgen command line : tckgen -algorithm Tensor_Det -grad dwi_blip1.txt dwi_blip1.nii -seed_image mask.nii -select 100K whole_brain_det.tck

I obtained this error: **[ERROR] DWI volumes could not be classified into b-value shells; gradient encoding may not represent a HARDI sequence

Could you please help me to solve this problem?

Your help is well appreciated.

Best,
Abir.

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