I tried to load a model which is trained in cntk into opencv 4.0.1 dnn module using the function readNetFromONNX(). I could successfully load and evaluate one model which have 116464 1*1*64*64 input shape but could not load another model which have 13224244 1*3*224*224 input shape. I end with up the error mentioned in the question. what could be the reason for this? Thanks in advance for your valuable help.