预处理时候反复遇到这个问题，检查过了还是报错，说是dataset.json中的语法格式问题，但是我已经验证过是没问题的？我想问一下有人预处理成功了吗？

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(lightmunet) root@I247f78114b00101cc2:/# nnUNetv2_plan_and_preprocess -d 801 --verify_dataset_integrity
Fingerprint extraction...
Dataset801_LiverCT
Traceback (most recent call last):
File "/usr/local/miniconda3/envs/lightmunet/bin/nnUNetv2_plan_and_preprocess", line 7, in
sys.exit(plan_and_preprocess_entry())
File "/usr/local/miniconda3/envs/lightmunet/lib/python3.10/site-packages/nnunetv2/experiment_planning/plan_and_preprocess_entrypoints.py", line 182, in plan_and_preprocess_entry
extract_fingerprints(args.d, args.fpe, args.npfp, args.verify_dataset_integrity, args.clean, args.verbose)
File "/usr/local/miniconda3/envs/lightmunet/lib/python3.10/site-packages/nnunetv2/experiment_planning/plan_and_preprocess_api.py", line 46, in extract_fingerprints
extract_fingerprint_dataset(d, fingerprint_extractor_class, num_processes, check_dataset_integrity, clean,
File "/usr/local/miniconda3/envs/lightmunet/lib/python3.10/site-packages/nnunetv2/experiment_planning/plan_and_preprocess_api.py", line 29, in extract_fingerprint_dataset
verify_dataset_integrity(join(nnUNet_raw, dataset_name), num_processes)
File "/usr/local/miniconda3/envs/lightmunet/lib/python3.10/site-packages/nnunetv2/experiment_planning/verify_dataset_integrity.py", line 191, in verify_dataset_integrity
label_manager = LabelManager(dataset_json['labels'], regions_class_order=dataset_json.get('regions_class_order'))
File "/usr/local/miniconda3/envs/lightmunet/lib/python3.10/site-packages/nnunetv2/utilities/label_handling/label_handling.py", line 24, in init
self._sanity_check(label_dict)
File "/usr/local/miniconda3/envs/lightmunet/lib/python3.10/site-packages/nnunetv2/utilities/label_handling/label_handling.py", line 53, in _sanity_check
raise RuntimeError('Background label not declared (remember that this should be label 0!)')
RuntimeError: Background label not declared (remember that this should be label 0!)