KeyError: 'captured_slice_thickness'

[pygabc1]

Hi, when I run the beginning part, which is preprocessing, of [Visualizing Model Input and Predictions.ipynb], I got an error of
KeyError: 'captured_slice_thickness'
How to fix this issue? Thanks.

from kits19cnn.io import Preprocessor
in_dir = r"...\data"
dset_dir = r"...\kits_preprocessed_isensee_spacing"
preprocess = Preprocessor(in_dir, dset_dir, kits_json_path=os.path.join(in_dir, "kits.json"),
with_mask=True)
preprocess.cases = preprocess.cases[:210]
print(f"Number of cases: {len(preprocess.cases)}")
preprocess.gen_data()