An error occurred while testing the model：json.decoder.JSONDecodeError: Extra data: line 1 column 5 (char 4)

[w1125]

When using the recognition model test, the following error is reported:

File "tools/test.py", line 235, in
main()
File "tools/test.py", line 204, in main
outputs = single_gpu_test(model, data_loader, args.show, args.show_dir,
File "/root/mmocr/mmocr/apis/test.py", line 72, in single_gpu_test
for data in data_loader:
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 521, in next
data = self._next_data()
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 1203, in _next_data
return self._process_data(data)
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/dataloader.py", line 1229, in _process_data
data.reraise()
File "/root/miniconda3/lib/python3.8/site-packages/torch/_utils.py", line 433, in reraise
raise RuntimeError(msg) from None
RuntimeError: Caught JSONDecodeError in DataLoader worker process 0.
Original Traceback (most recent call last):
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/_utils/worker.py", line 287, in _worker_loop
data = fetcher.fetch(index)
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/_utils/fetch.py", line 49, in fetch
data = [self.dataset[idx] for idx in possibly_batched_index]
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/_utils/fetch.py", line 49, in
data = [self.dataset[idx] for idx in possibly_batched_index]
File "/root/miniconda3/lib/python3.8/site-packages/torch/utils/data/dataset.py", line 308, in getitem
return self.datasets[dataset_idx][sample_idx]
File "/root/mmocr/mmocr/datasets/base_dataset.py", line 141, in getitem
return self.prepare_test_img(index)
File "/root/mmocr/mmocr/datasets/base_dataset.py", line 113, in prepare_test_img
return self.prepare_train_img(img_info)
File "/root/mmocr/mmocr/datasets/base_dataset.py", line 98, in prepare_train_img
img_info = self.data_infos[index]
File "/root/mmocr/mmocr/datasets/utils/loader.py", line 65, in getitem
return self.parser.get_item(self.ori_data_infos, index)
File "/root/mmocr/mmocr/datasets/utils/parser.py", line 75, in get_item
line_json_obj = json.loads(json_str)
File "/root/miniconda3/lib/python3.8/json/init.py", line 357, in loads
return _default_decoder.decode(s)
File "/root/miniconda3/lib/python3.8/json/decoder.py", line 340, in decode
raise JSONDecodeError("Extra data", s, end)
json.decoder.JSONDecodeError: Extra data: line 1 column 5 (char 4)

my dataset config:

dataset_type = 'OCRDataset'
root = 'data/iiit5k'
train_anno_file1 = f'{root}/train_label.txt'
train1 = dict(
type=dataset_type,
img_prefix=f'{root}/imgs/train',
ann_file=train_anno_file1,
loader=dict(
type='AnnFileLoader',
repeat=100,
file_format='txt',
file_storage_backend='disk',
parser=dict(
type='LineStrParser',
keys=['filename', 'text'],
keys_idx=[0, 1],
separator=' ')),
pipeline=None,
test_mode=False)
test_anno_file1 = f'{root}/test_label.txt'
test = dict(
type=dataset_type,
img_prefix=f'{root}/imgs/test',
ann_file=test_anno_file1,
loader=dict(
type='AnnFileLoader',
repeat=1,
file_format='txt',
file_storage_backend='disk',
parser=dict(type='LineJsonParser', keys=['filename', 'text'])),
pipeline=None,
test_mode=True)
train_list = [train1]
test_list = [test]

Is it a problem with labeling documents, I hope to get some suggestions.Thanks.