ValueError: invalid literal for int() with base 10: ' How can I fix it？

Traceback (most recent call last):
File "D:\Downloads\slowfast\slowfast\tools\run_net.py", line 50, in
main()
File "D:\Downloads\slowfast\slowfast\tools\run_net.py", line 26, in main
launch_job(cfg=cfg, init_method=args.init_method, func=train)
File "d:\downloads\slowfast\slowfast\slowfast\utils\misc.py", line 421, in launch_job
func(cfg=cfg)
File "D:\Downloads\slowfast\slowfast\tools\train_net.py", line 579, in train
train_loader = loader.construct_loader(cfg, "train")
File "d:\downloads\slowfast\slowfast\slowfast\datasets\loader.py", line 115, in construct_loader
dataset = build_dataset(dataset_name, cfg, split)
File "d:\downloads\slowfast\slowfast\slowfast\datasets\build.py", line 31, in build_dataset
return DATASET_REGISTRY.get(name)(cfg, split)
File "d:\downloads\slowfast\slowfast\slowfast\datasets\ava_dataset.py", line 50, in __init__
self._load_data(cfg)
File "d:\downloads\slowfast\slowfast\slowfast\datasets\ava_dataset.py", line 66, in _load_data
boxes_and_labels = ava_helper.load_boxes_and_labels(cfg, mode=self._split)
File "d:\downloads\slowfast\slowfast\slowfast\datasets\ava_helper.py", line 93, in load_boxes_and_labels
all_boxes, count, unique_box_count = parse_bboxes_file(
File "d:\downloads\slowfast\slowfast\slowfast\datasets\ava_helper.py", line 194, in parse_bboxes_file
video_name, frame_sec = row[0], int(row[1])
ValueError: invalid literal for int() with base 10: '