How to fix "Cant load pretrained model"?

Question

OpenCV

**Cant load pretrained model **
Net net;

if (framework == "torch")
net = cv::dnn::readNetFromTorch(mode);
else


terminate called after throwing an instance of 'cv::Exception'
what(): OpenCV(4.5.1) /home/opencvapp/opencv-4.5.1/modules/dnn/src/torch/torch_importer.cpp:1017: error : (-213:The function/feature is not implemented) Unsupported Lua type in function 'readObject'