Exception with OpenCV4.5.5 DnnSuperResImpl - ReadModel (C++) - c++

Question

I have a issue when using OpenCV dnn module.
Here are my settings:
Building OpenCV 4.5.5 with extra module opencv_contrib-4.x (clone from github)
Downloading EDSR_x4.pb and EDSR_x3.pb from EDSR_tensorflow
move .pb files to root directory of my project
However, no matter I used relative path or absolute path, readModel() failed for these two path:
DnnSuperResImpl sr;
sr.readModel ("EDSR_X4.pb");
sr.readModel ("C:\\Users\\user\\source\\repos\\ZBAR_OpenCV4.5\\ZBAR_OpenCV4.5\\EDSR_x3.pb");
Results from using command "dir"
C:\Users\user\source\repos\ZBAR_OpenCV4.5\ZBAR_OpenCV4.5
2022/06/13 afternoon 01:39 201,562 EDSR_x3.pb
2022/06/13 afternoon 10:40 206,908 EDSR_x4.pb
2022/06/07 afternoon 11:37 3,124 ZBAR_OpenCV4.5.cpp
2022/06/07 afternoon 11:37 544 ZBAR_OpenCV4.5.h
2022/06/13 afternoon 02:05 8,719 ZBAR_OpenCV4.5Dlg.cpp
2022/06/13 afternoon 11:37 1,627 ZBAR_OpenCV4.5Dlg.h
Exception printed out:
code= -2
err= FAILED: ReadProtoFromBinaryFile(param_file, param) Failed to parse GraphDef file: EDSR_x4.pb
func= cv::dnn::ReadTFNetParamsFromBinaryFileOrDie
line= 42
msg= OpenCV(4.5.5) C:\OpenCV4.5\opencv\sources\modules\dnn\src\tensorflow\tf_io.cpp:42: error: (-2:Unspecified error) FAILED: ReadProtoFromBinaryFile(param_file, param). Failed to parse GraphDef file: EDSR_x4.pb in function 'cv::dnn::ReadTFNetParamsFromBinaryFileOrDie'
what= OpenCV(4.5.5) C:\OpenCV4.5\opencv\sources\modules\dnn\src\tensorflow\tf_io.cpp:42: error: (-2:Unspecified error) FAILED: ReadProtoFromBinaryFile(param_file, param). Failed to parse GraphDef file: EDSR_x4.pb in function 'cv::dnn::ReadTFNetParamsFromBinaryFileOrDie'

Answer 1

The solution is really simple.
Just check if the integrity of EDSR_x4.pb is a pb file or a html, and I incorrectly used the later.
So, I download from the github again, and it worked.