Is there any specific way to run niworkflows?

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Basically I am trying to run niworkflows.func.util.init_boldref_wf but its giving me an error
TraitError: Each element of the 'transform_parameters' trait of a _FixHeaderRegistrationInputSpec instance must be a tuple of the form: (a float) or a tuple of the form: (a float, a float, a float) or a tuple of the form: (a float, an integer, an integer, an integer) or a tuple of the form: (a float, an integer, a float, a float, a float, a float) or a tuple of the form: (a float, a float, a float, an integer) or a tuple of the form: (a float, an integer, an integer, an integer, an integer), but a value of [0.1] <class 'list'> was specified.

Here is my code

nifti = nib.load('/mnt/d/HCP/102109/MNINonLinear/Results/rfMRI_REST1_LR/rfMRI_REST1_LR.nii.gz')
sbref = nib.load('/mnt/d/HCP/102109/MNINonLinear/Results/rfMRI_REST1_LR/rfMRI_REST1_LR_SBRef.nii.gz')
bold_ref_wf = init_bold_reference_wf(omp_nthreads=3, 
                                     bold_file=nifti_str, 
                                     sbref_files=[sbref_str], 
                                     brainmask_thresh=0.85, 
                                     pre_mask=False, 
                                     multiecho=False, 
                                     name='bold_reference_wf', 
                                     gen_report=False)
bold_ref_wf.run()

May I please get some guidance on this?