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OpenCV + Darknet - Error when initializing darknet

Hi! I'm an university student and for my thesis work I have to perform object detection using YOLO.

I read the related paper and I completed all of the command line examples located at https://pjreddie.com/darknet/yolo/.

Now I have to do the same using OpenCV. I'm using Xubuntu 16.04 LTS x64, OpenCV 3.3.1 and Qt Creator 4.5.0.

For the moment I'm stuck at these few lines because I can't succeed to initialize the network.

#include <opencv2/core.hpp>
#include <opencv2/dnn.hpp>
#include <opencv2/dnn/shape_utils.hpp>
#include <iostream>

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

int main()
{
    // The path to the .cfg file with text description of the network architecture.
    String modelConfiguration = "/home/lorenzo/Scrivania/yolo-9000/darknet/cfg/yolo-9000.cfg";
    // The path to the .weights file with learned network.
    String modelBinary = "/home/lorenzo/Scrivania/yolo-9000/yolo9000-weights/yolo-9000.weights";

    //! [Initialize network]
    //Reads a network model stored in Darknet model files.
    dnn::Net net = readNetFromDarknet(modelConfiguration, modelBinary);
    //! [Initialize network]

    if (net.empty())
    {
        cerr << "Can't load network by using the following files: " << endl;
        cerr << "cfg-file:     " << modelConfiguration << endl;
        cerr << "weights-file: " << modelBinary << endl;
        exit(-1);
    }

    return 0;
}

It returns me the following error.

OpenCV Error: Parsing error (Failed to parse NetParameter file: /home/lorenzo/Scrivania/yolo-9000/darknet/cfg/yolo-9000.cfg) in ReadNetParamsFromCfgFileOrDie,
                      file /home/lorenzo/Scrivania/opencv-3.3.1/modules/dnn/src/darknet/darknet_io.cpp, line 612
terminate called after throwing an instance of 'cv::Exception'
what():  /home/lorenzo/Scrivania/opencv-3.3.1/modules/dnn/src/darknet/darknet_io.cpp:612:
            error: (-212) Failed to parse NetParameter file: /home/lorenzo/Scrivania/yolo-9000/darknet/cfg/yolo-9000.cfg in function ReadNetParamsFromCfgFileOrDie

I opened the file at "/home/lorenzo/Scrivania/opencv-3.3.1/modules/dnn/src/darknet/darknet_io.cpp" and I found the following code at lines 609:614.

void ReadNetParamsFromCfgFileOrDie(const char *cfgFile, darknet::NetParameter *net)
        {
            if (!darknet::ReadDarknetFromCfgFile(cfgFile, net)) {
                CV_Error(cv::Error::StsParseError, "Failed to parse NetParameter file: " + std::string(cfgFile));
            }
        }

The output of cv::getBuildInformation() is the following.

General configuration for OpenCV 3.3.1 =====================================
  Version control:               unknown

  Platform:
    Timestamp:                   2017-12-13T21:08:24Z
    Host:                        Linux 4.10.0-42-generic x86_64
    CMake:                       3.5.1
    CMake generator:             Unix Makefiles
    CMake build tool:            /usr/bin/make
    Configuration:               Release

  CPU/HW features:
    Baseline:                    SSE SSE2 SSE3
      requested:                 SSE3
    Dispatched code generation:  SSE4_1 SSE4_2 FP16 AVX AVX2
      requested:                 SSE4_1 SSE4_2 AVX FP16 AVX2
      SSE4_1 (3 files):          + SSSE3 SSE4_1
      SSE4_2 (1 files):          + SSSE3 SSE4_1 POPCNT SSE4_2
      FP16 (2 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 AVX
      AVX (5 files):             + SSSE3 SSE4_1 POPCNT SSE4_2 AVX
      AVX2 (8 files):            + SSSE3 SSE4_1 POPCNT SSE4_2 FP16 FMA3 AVX AVX2

  C/C++:
    Built as dynamic libs?:      YES
    C++ Compiler:                /usr/bin/c++  (ver 5.4.0)
    C++ flags (Release):         -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -O3 -DNDEBUG  -DNDEBUG
    C++ flags (Debug):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wuninitialized -Winit-self -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections  -msse -msse2 -msse3 -fvisibility=hidden -fvisibility-inlines-hidden -g  -O0 -DDEBUG -D_DEBUG
    C Compiler:                  /usr/bin/cc
    C flags (Release):           -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections  -msse -msse2 -msse3 -fvisibility=hidden -O3 -DNDEBUG  -DNDEBUG
    C flags (Debug):             -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wuninitialized -Winit-self -Wno-narrowing -Wno-comment -fdiagnostics-show-option -Wno-long-long -pthread -fomit-frame-pointer -ffunction-sections  -msse -msse2 -msse3 -fvisibility=hidden -g  -O0 -DDEBUG -D_DEBUG
    Linker flags (Release):
    Linker flags (Debug):
    ccache:                      NO
    Precompiled headers:         YES
    Extra dependencies:          dl m pthread rt
    3rdparty dependencies:

  OpenCV modules:
    To be built:                 core flann imgproc ml objdetect photo video dnn imgcodecs shape videoio highgui superres ts features2d calib3d stitching videostab
    Disabled:                    js world
    Disabled by dependency:      -
    Unavailable:                 cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev java python2 python3 viz

  GUI: 
    QT:                          NO
    GTK+ 2.x:                    YES (ver 2.24.30)
    GThread :                    YES (ver 2.48.2)
    GtkGlExt:                    NO
    OpenGL support:              NO
    VTK support:                 NO

  Media I/O: 
    ZLib:                        /usr/lib/x86_64-linux-gnu/libz.so (ver 1.2.8)
    JPEG:                        libjpeg (ver 90)
    WEBP:                        build (ver encoder: 0x020e)
    PNG:                         /usr/lib/x86_64-linux-gnu/libpng.so (ver 1.2.54)
    TIFF:                        build (ver 42 - 4.0.2)
    JPEG 2000:                   build (ver 1.900.1)
    OpenEXR:                     build (ver 1.7.1)
    GDAL:                        NO
    GDCM:                        NO

  Video I/O:
    DC1394 1.x:                  NO
    DC1394 2.x:                  NO
    FFMPEG:                      YES
      avcodec:                   YES (ver 56.60.100)
      avformat:                  YES (ver 56.40.101)
      avutil:                    YES (ver 54.31.100)
      swscale:                   YES (ver 3.1.101)
      avresample:                NO
    GStreamer:                   NO
    OpenNI:                      NO
    OpenNI PrimeSensor Modules:  NO
    OpenNI2:                     NO
    PvAPI:                       NO
    GigEVisionSDK:               NO
    Aravis SDK:                  NO
    UniCap:                      NO
    UniCap ucil:                 NO
    V4L/V4L2:                    NO/YES
    XIMEA:                       NO
    Xine:                        NO
    Intel Media SDK:             NO
    gPhoto2:                     NO

  Parallel framework:            pthreads

  Trace:                         YES (with Intel ITT)

  Other third-party libraries:
    Use Intel IPP:               2017.0.3 [2017.0.3]
               at:               /home/lorenzo/Scrivania/opencv-3.3.1-build/3rdparty/ippicv/ippicv_lnx
    Use Intel IPP IW:            sources (2017.0.3)
                  at:            /home/lorenzo/Scrivania/opencv-3.3.1-build/3rdparty/ippicv/ippiw_lnx
    Use VA:                      NO
    Use Intel VA-API/OpenCL:     NO
    Use Lapack:                  NO
    Use Eigen:                   NO
    Use Cuda:                    NO
    Use OpenCL:                  YES
    Use OpenVX:                  NO
    Use custom HAL:              NO

  OpenCL:                        <Dynamic loading of OpenCL library>
    Include path:                /home/lorenzo/Scrivania/opencv-3.3.1/3rdparty/include/opencl/1.2
    Use AMDFFT:                  NO
    Use AMDBLAS:                 NO

  Python 2:
    Interpreter:                 /usr/bin/python2.7 (ver 2.7.12)

  Python 3:
    Interpreter:                 /usr/bin/python3 (ver 3.5.2)

  Python (for build):            /usr/bin/python2.7

  Java:
    ant:                         NO
    JNI:                         NO
    Java wrappers:               NO
    Java tests:                  NO

  Matlab:                        Matlab not found or implicitly disabled

  Documentation:
    Doxygen:                     NO

  Tests and samples:
    Tests:                       YES
    Performance tests:           YES
    C/C++ Examples:              NO

  Install path:                  /usr/local

  cvconfig.h is in:              /home/lorenzo/Scrivania/opencv-3.3.1-build
-----------------------------------------------------------------

Hope you can help me to solve this. Thanks in advance!