Missing fieldmap workflow

yes, I run into an error when I don’t specify pybids db, maybe I had a typo somewhere

Process Process-2:
Traceback (most recent call last):
  File "/opt/conda/envs/fmriprep/lib/python3.12/multiprocessing/process.py", line 314, in _bootstrap
    self.run()
  File "/opt/conda/envs/fmriprep/lib/python3.12/multiprocessing/process.py", line 108, in run
    self._target(*self._args, **self._kwargs)
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/fmriprep/cli/workflow.py", line 126, in build_workflow
    retval['workflow'] = init_fmriprep_wf()
                         ^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/fmriprep/workflows/base.py", line 95, in init_fmriprep_wf
    single_subject_wf = init_single_subject_wf(subject_id)
                        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/fmriprep/workflows/base.py", line 767, in init_single_subject_wf
    bold_wf = init_bold_wf(
              ^^^^^^^^^^^^^
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/fmriprep/workflows/bold/base.py", line 253, in init_bold_wf
    bold_fit_wf = init_bold_fit_wf(
                  ^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/fmriprep/workflows/bold/fit.py", line 481, in init_bold_fit_wf
    enhance_boldref_wf = init_enhance_and_skullstrip_bold_wf(omp_nthreads=omp_nthreads)
                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/niworkflows/func/util.py", line 427, in init_enhance_and_skullstrip_bold_wf
    AI(
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/nipype/interfaces/ants/base.py", line 76, in __init__
    super().__init__(**inputs)
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/nipype/interfaces/base/core.py", line 633, in __init__
    super().__init__(**inputs)
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/nipype/interfaces/base/core.py", line 204, in __init__
    self.inputs.trait_set(**inputs)
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/traits/has_traits.py", line 1458, in trait_set
    setattr(self, name, value)
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/nipype/interfaces/base/traits_extension.py", line 325, in validate
    value = super().validate(objekt, name, value, return_pathlike=True)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/nipype/interfaces/base/traits_extension.py", line 135, in validate
    self.error(objekt, name, str(value))
  File "/opt/conda/envs/fmriprep/lib/python3.12/site-packages/traits/base_trait_handler.py", line 74, in error
    raise TraitError(
traits.trait_errors.TraitError: The 'fixed_image' trait of an AIInputSpec instance must be a pathlike object or string representing an existing file, but a value of '[]' <class 'str'> was specified.