[ WARN:0@0.008] global D:\a\opencv-python\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp (239) cv::findDecoder imread_('./03_鍙嶇埇涓庡弽鍙嶇埇/imgs/cpt1.png'): can't open/read file: check file path/integrity

[ WARN:0@0.012] global D:\a\opencv-python\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp (239) cv::findDecoder imread_('./03_鍙嶇埇涓庡弽鍙嶇埇/imgs/cpt2.png'): can't open/read file: check file path/integrity

Traceback (most recent call last):

  File "d:\code\python\spider_code\03_反爬与反反爬\06_滑动验证码_获取滑动长度.py", line 28, in <module>

    get_long()

  File "d:\code\python\spider_code\03_反爬与反反爬\06_滑动验证码_获取滑动长度.py", line 25, in get_long

    cv2.imwrite('./03_反爬与反反爬/imgs/tcpt2.png',canny1)

cv2.error: OpenCV(4.6.0) D:\a\opencv-python\opencv-python\opencv\modules\imgcodecs\src\loadsave.cpp:801: error: (-215:Assertion failed) !_img.empty() in function 'cv::imwrite'

老师这是什么错误啊，怎么解决