Assertion failed(attribute_proto.ints_size()==2 in cv::dnn

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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 1*1*64*64 input shape but could not load another model which have 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.