How can I fix the error, "FileNotFoundError: [Errno 2] No such file or directory" in this tool?

I installed all requirements for this tool and I run it too but as soon as I click on Open Exam... and give it the path to the dicom files and then when I click on Calculate Volume after some seconds the program gets closed and in CMD I see this error:

C:\Users\Lenovo\Downloads\HARTA-main>C:\Users\Lenovo\Downloads\HARTA-main\harta.pyTraceback (most recent call last):  File "C:\Users\Lenovo\Downloads\HARTA-main\harta.py", line 486, in generateVolume    patient_id, no_slices, vol = _automatic_.segmentEpicardialFat(DICOM_DATASET=dir, OUTPUT_FOLDER='aux_img/')  File "C:\Users\Lenovo\Downloads\HARTA-main\_automatic_.py", line 61, in segmentEpicardialFat    images_png = np.stack([convert_image_to_rgb(dicom, f'slices/{patient_id}_{i}', OUTPUT_FOLDER) for dicom, i in zip(median, range(0,no_slices))])  File "C:\Users\Lenovo\Downloads\HARTA-main\_automatic_.py", line 61, in <listcomp>    images_png = np.stack([convert_image_to_rgb(dicom, f'slices/{patient_id}_{i}', OUTPUT_FOLDER) for dicom, i in zip(median, range(0,no_slices))])  File "C:\Users\Lenovo\Downloads\HARTA-main\algorithm\basicOperations.py", line 9, in convert_image_to_rgb    plt.imsave(f'{output_folder}{filename}.png', image, cmap='gray')  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python38\lib\site-packages\matplotlib\pyplot.py", line 2251, in imsave    return matplotlib.image.imsave(fname, arr, **kwargs)  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python38\lib\site-packages\matplotlib\image.py", line 1611, in imsave    image.save(fname, **pil_kwargs)  File "C:\Users\Lenovo\AppData\Local\Programs\Python\Python38\lib\site-packages\PIL\Image.py", line 2161, in save    fp = builtins.open(filename, "w+b")FileNotFoundError: [Errno 2] No such file or directory: 'aux_img/slices/21227013_0.png'

The error says No such file or directory: 'aux_img/slices/21227013_0.png' and here is the line 486 and some lines under it:

    def generateVolume(self):        global patient_id        global no_slices        patient_id, no_slices, vol = _automatic_.segmentEpicardialFat(DICOM_DATASET=dir, OUTPUT_FOLDER='aux_img/')        self.volume.setText(str(round(vol, 1)))        self.refreshAfterAutomatic()    def generateNewVolume(self):        patient_id, no_slices, vol = _semiautomatic_.segmentEpicardialFat(DICOM_DATASET=dir, OUTPUT_FOLDER='aux_img/')        self.volume_2.setText(str(round(vol, 1)))        self.refreshAfterSemiAutomatic()'INTERFACE MANAGER'    def updateImage(self, slice_id):"Show container"        self.manual_intervention.show()        self.semiLabel.show()        self.afterEditionBox.hide()        self.slice_id = slice_id        self.editionHandler()'Show the image with new contour'        self.imageHeart.setPixmap(QtGui.QPixmap(':/aux/edited_successfully_bg.png'))

And this is the link to the file.

Can you enlighten me how to fix this problem?