string indices must be integers when using paddleocr

[zfb132]

Please provide the following information to quickly locate the problem

System Environment：Win11 amd64 Version

• Paddle： 2.3.2.post116
• PaddleOCR： 2.6.1.0
• Related components：recovery_to_doc

Status

• Command Code：paddleocr --image_dir=D:/test.pdf --type=structure --recovery=true --table=false
• Complete Error Message：error in layout recovery image:test, err msg: string indices must be integers

Also, I have cloned the latest code 6228d1e and run the following:
python paddleocr.py --image_dir=D:/test.pdf --type=structure --recovery=true --table=false
The same error occurred.