Darknet-Yolo: java.lang.Exception: unknown exception (org.opencv.dnn.Net.forward_4)

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In OpenCV-Yolo

I use the following function to use the (.cfg) and (.weights) file for object detection in Java

net = Dnn.readNetFromDarknet(cfg, weights);

    float scale = 1.0F / 255.0F;
    Mat inputBlob = Dnn.blobFromImage(resized, scale, sz, new Scalar(0), false, false);
    net.setInput(inputBlob, "data");

    System.out.println("Detect Classes: " + classes_names.length);

    java.util.List<Mat> result = new java.util.ArrayList<Mat>(2);
    java.util.List<java.lang.String> outBlobNames = new java.util.ArrayList<java.lang.String>(2);
    outBlobNames.add(0, "yolo_16");
    outBlobNames.add(1, "yolo_23");
    net.forward(result, outBlobNames);

    Mat result_1 = result.get(0);
    Mat result_2 = result.get(1);

    for (Mat mat : result) {
        ExtractBeanFromMat(mat, im, frame, im_copy);
    }

The following is the exception log:

Detect Classes: 2

java.lang.Exception: unknown exception
    at org.opencv.dnn.Net.forward_4(Native Method)
    at org.opencv.dnn.Net.forward(Net.java:333)
    at InheritClass.ObjectDetectionHelper.detect(ObjectDetectionHelper.java:134)
    at DetectionCar.DetectCar.detect(DetectCar.java:26)
    at InheritClass.ObjectDetectionHelper.detect(ObjectDetectionHelper.java:94)
    at InheritClass.ObjectDetectionHelper.detect_directory(ObjectDetectionHelper.java:227)
    at DetectionCar.DetectCar.main(DetectCar.java:31)