opencv 3.3.1 my trained tiny yolo Assert at region_layer.cpp line 87

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Hi, I am using c++. open cv 3.3.1 vs2015 on windows. I was able to run open cv dnn loading yolo and tiny yolo from the internet. I used darknet.exe (my compilation ) to train tiny-yolo on license plate images. The trained network is working on with darknet.exe. I want to run it with opencv but get the above error.