Cannot load my YOLOv3 model into readNetFromDarknet

Question

So I have trained a YOLOv3 model and want to test the accuracy of the model. I am trying to load the model by using the command 'cv2.dnn.readNetFromDarknet'. Every time I try I receive the error

Traceback (most recent call last):
File "C:\Users\Philip\PycharmProjects\Scriptie\venv\tester.py", line 9, in <module>
net = cv2.dnn.readNetFromDarknet(modelConfiguration, modelWeights)
cv2.error: OpenCV(4.5.5) D:\a\opencv-python\opencv-python\opencv\modules\dnn\src\darknet\darknet_io.cpp:660: error: (-215:Assertion failed) separator_index < line.size() in function 'cv::dnn::darknet::ReadDarknetFromCfgStream'

The python code that I am using is shown below:

import cv2
import numpy as np
import matplotlib.pyplot as pl
classes = ['TEETH']

modelConfiguration = r"C:\Users\Philip\PycharmProjects\Scriptie\venv\yolov3_custom.cfg"
modelWeights = r"C:\Users\Philip\PycharmProjects\Scriptie\venv\yolov3_custom_2000.weights"

net = cv2.dnn.readNetFromDarknet(modelConfiguration, modelWeights)

I have tried changing the paths to absolute paths but it didn't work, anyone that can help me with this?