code: def _validate_ft_struct(ft_struct):
      """Run validation checks on the ft_structure."""
      if isinstance(ft_struct, list):
          raise RuntimeError(
              "Loading of data in cell arrays is not supported"
          )
  
file_path: mne-python/mne/io/fieldtrip/utils.py
imports: import numpy
  from ..._fiff._digitization import DigPoint, _ensure_fiducials_head
  from ..._fiff.constants import FIFF
  from ..._fiff.meas_info import create_info
  from ..._fiff.pick import pick_info
  from ...transforms import rotation3d_align_z_axis
  from ...utils import _check_pandas_installed, warn
label_desc: Use image node_id 1 for calling a global function with example usage: _validate_ft_struct(ft_struct) without return types