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Can't open "deploy.prototxt.txt," in function 'cv::dnn::ReadProtoFromTextFile'

I was just starting working on this OpenCV tutorial, and can't even get past the first part :<

Downloaded all the files. Opened detect_faces.py in PyCharm, followed the instructions here for using arguments in PyCharm. Inserted "-i rooster.jpg, -p deploy.prototxt.txt, -m res10_300x300_ssd_iter_140000.caffemodel" into Parameters field and tried running it, but it threw an error:

net = cv2.dnn.readNetFromCaffe(args["prototxt"], args["model"])
cv2.error: OpenCV(3.4.2) C:\Miniconda3\conda-bld\opencv-suite_1534379934306\work\modules\dnn\src\caffe\caffe_io.cpp:1121: error: (-2:Unspecified error) FAILED: fs.is_open(). Can't open "deploy.prototxt.txt," in function 'cv::dnn::ReadProtoFromTextFile'

this is the first part of the py file:

import numpy as np
import argparse
import cv2

# construct the argument parse and parse the arguments
ap = argparse.ArgumentParser()
ap.add_argument("-i", "--image", required=True,
                help="path to input image")
ap.add_argument("-p", "--prototxt", required=True,
                help="path to Caffe 'deploy' prototxt file")
ap.add_argument("-m", "--model", required=True,
                help="path to Caffe pre-trained model")
ap.add_argument("-c", "--confidence", type=float, default=0.5,
                help="minimum probability to filter weak detections")
args = vars(ap.parse_args())

not sure what the issue is... Any help is appreciated.