在转换时报错，错误如下

Start converting !
41%|███████████████▏ | 2310/5605 [00:00<00:01, 3086.04it/s]
Traceback (most recent call last):
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 448, in
main()
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 344, in main
output_file=args.voc_out_name)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 268, in voc_xmls_to_cocojson
ann = voc_get_coco_annotation(obj=obj, label2id=label2id)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 236, in voc_get_coco_annotation
assert xmax > xmin and ymax > ymin, "Box size error."
AssertionError: Box size error.
Start converting !
43%|███████████████▉ | 1687/3923 [00:00<00:00, 3228.06it/s]
Traceback (most recent call last):
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 448, in
main()
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 344, in main
output_file=args.voc_out_name)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 268, in voc_xmls_to_cocojson
ann = voc_get_coco_annotation(obj=obj, label2id=label2id)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 236, in voc_get_coco_annotation
assert xmax > xmin and ymax > ymin, "Box size error."
AssertionError: Box size error.
Start converting !
0%| | 0/623 [00:00Traceback (most recent call last):
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 448, in
main()
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 344, in main
output_file=args.voc_out_name)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 268, in voc_xmls_to_cocojson
ann = voc_get_coco_annotation(obj=obj, label2id=label2id)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 236, in voc_get_coco_annotation
assert xmax > xmin and ymax > ymin, "Box size error."
AssertionError: Box size error.
Start converting !
38%|██████████████▌ | 644/1682 [00:00<00:00, 1910.03it/s]
Traceback (most recent call last):
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 448, in
main()
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 344, in main
output_file=args.voc_out_name)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 268, in voc_xmls_to_cocojson
ann = voc_get_coco_annotation(obj=obj, label2id=label2id)
File "/home/aistudio/work/PaddleDetection-release-2.3/tools/x2coco.py", line 236, in voc_get_coco_annotation
assert xmax > xmin and ymax > ymin, "Box size error."
AssertionError: Box size error.