Failed to parse NetParameter file: colorization_release_v2.caffemodel

I am trying to deploy my app since a week but unfortunattly its giving errors .i also tried in heroku getting same errors .Pls help me to resolve the error

net = cv2.dnn.readNet(prototxt, caffe_model)
cv2.error: OpenCV(4.6.0) /io/opencv/modules/dnn/src/caffe/caffe_io.cpp:1176: error: (-2:Unspecified error) FAILED: ReadProtoFromBinaryFile(param_file, param). Failed to parse NetParameter file: colorization_release_v2.caffemodel in function 'ReadNetParamsFromBinaryFileOrDie'