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Assertion failed in function total (dnn::forward)

Hello,

I'm facing a problem that I have no idea why it is happening. I have the following code:

#include <iostream>
#include <opencv2/dnn.hpp>
#include <opencv2/imgproc.hpp>
#include <opencv2/highgui.hpp>

using namespace cv;
using namespace cv::dnn;
using namespace std;

int main(int argc, char **argv) {
    dnn::Net net = readNetFromTensorflow(argv[1]);
    if(net.empty()) exit(-1);

    for(string s : net.getLayerNames())
        cout << s << " " << net.getLayerId(s) << endl;

    //Mat img(224, 224, CV_8UC3);   
    Mat img(96, 96, CV_8UC1);

    Mat inputBlob = blobFromImage(img);
    net.setInput(inputBlob);

    //Mat result = net.forward("softmax2");
    Mat result = net.forward("own_namespace_123/out/add");

    for(int i=0; i < result.dims; i++)
        cout << result.size[i] << " ";
    cout << endl;
}

When I use the inception network from the example (https://storage.googleapis.com/download.tensorflow.org/models/inception5h.zip), everything works:

conv2d0_pre_relu/conv 2
conv2d0 3
maxpool0 4
localresponsenorm0 5
conv2d1_pre_relu/conv 6
...
softmax1 158
avgpool0/reshape 159
softmax2_pre_activation/matmul 160
softmax2 161
1 1008

However, when a try to use my own network, the loading part works, but the forward function gives the following error:

OpenCV Error: Assertion failed (start < (int)shape.size() && end <= (int)shape.size() && start <= end) in total, file /home/mauricio/Libraries/OpenCV3.3/opencv-3.3.0/modules/dnn/include/opencv2/dnn/shape_utils.hpp, line 159
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/mauricio/Libraries/OpenCV3.3/opencv-3.3.0/modules/dnn/include/opencv2/dnn/shape_utils.hpp:159: error: (-215) start < (int)shape.size() && end <= (int)shape.size() && start <= end in function total
Aborted (core dumped)

Has anyone any idea why?