TypeError: 'NoneType' object is not iterable

[fuhengwu2021]

请提供下述完整信息以便快速定位问题/Please provide the following information to quickly locate the problem

• 系统环境/System Environment：Linux
• 版本号/Version：Paddle： PaddleOCR： 问题相关组件/Related components：2.7
• 运行指令/Command Code：paddleocr --image_dir 2023-09-26-11-04-19.png --use_angle_cls false --use_gpu true --rec false --det_algorithm="DB"
• 完整报错/Complete Error Message：

Traceback (most recent call last):
  File "/home/fuhwu/miniconda3/envs/docai/bin/paddleocr", line 8, in <module>
    sys.exit(main())
  File "/home/fuhwu/miniconda3/envs/docai/lib/python3.8/site-packages/paddleocr/paddleocr.py", line 805, in main
    for line in res:
TypeError: 'NoneType' object is not iterable

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请尽量不要包含图片在问题中/Please try to not include the image in the issue.