Dwifslpreproc error with a different data

Hi,

When I used dwifslpreproc command for a patient data, it works without any problem. However, when I used for a different patient’s data, I get the following error:
dwifslpreproc: [ERROR] eddy* --imain=eddy_in.nii --mask=eddy_mask.nii --acqp=eddy_config.txt --index=eddy_indices.txt --bvecs=bvecs --bvals=bvals --slm=linear --data_is_shelled --out=dwi_post_eddy --verbose (app.py:199)

What could be the reason for this.

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