DWIconvert error

Operating system: macos 10.14.6
Slicer version: 4.10.2

Dear 3Dslicer team,

I am trying to visualize a FSL output file in slicer. I am trying to convert the output nifti file to .nrrd format using DWIconvert but unfortunately does not work. It says the gradients does not match the volumes. I ran the whole process with FSL and there was no problem, so was wondering what could be wrong with my bvectors. Or am I missing something here. Your hint would be very much appreciated.
Thank you.

Error message:

Diffusion-weighted DICOM Import (DWIConvert) standard error:

libc++abi.dylib: terminating with uncaught exception of type itk::ExceptionObject: /Volumes/Dashboards/Stable/Slicer-4102-build/BRAINSTools/DWIConvert/DWIConvertLib.cxx:108:

itk::ERROR: Exception creating converter

itk::ExceptionObject (0x7fe6b0f79f70)

Location: “unknown”

File: /Volumes/Dashboards/Stable/Slicer-4102-build/BRAINSTools/DWIConvert/DWIConverter.cxx

Line: 227

Description: itk::ERROR: number of Gradients doesn’t match number of volumes:129 != 1

You can try dcm2niix, which supports both nifti and nrrd. It is available stand-alone or part of SlicerDMRI.