Youtube-dl subscription to mp3

So my goal is to make code so it would automatically download from all my subscribed Youtube channels to mp3 files. I having difficulty to deal with EO error which is not clear for me, thus I never had to deal with it, I've done research but nothing could help me out, so here's the code:

import opml
import feedparser
import youtube_dl
from glob import glob
from pprint import pprint

from time import time, mktime, strptime
from datetime import datetime

if len(glob('last.txt')) == 0:
    f = open ('last.txt' , 'w')
    f.write(str(time()))
    print('Initialized last.txt file for timestamp')
    f.close()
else:
    f = open('last.txt' , 'r')
    content = f.read()
    f.close()
    
    outline = opml.parse('subs.xml')
    
    ptime = datetime.utcfromtimestamp(float(content))
    ftime = time()
    urls = []
    for i in range(0,len(outline[0])):
        urls.append(outline[0][i].xmlUrl)
    print(urls)
    
    videos = []
    for i in range(0,len(urls)):
        print('Parsing through channel '+str(i+1)+' out of '+str(len(urls)), end='\r')
        feed = feedparser.parse(urls[i])
        for j in range(0,len(feed['items'])):
            timef = feed['items'][j]['published_parsed']
            dt = datetime.fromtimestamp(mktime(timef))
            if dt > ptime:
                videos.append(feed['items'][j]['link'])
                
    if len(videos) == 0:
        print('Sorry, no new video found')
    else:
        print(str(len(videos))+' bew vudeis found')
        
    ydl_options = {
            'ignoreerrors' : True,
            'format': 'bestaudio[filesize<30]',
            'keepvideo': False,
            'outtmpl': 'filename',
            'postprocessors': [{
                    'key': 'FFmpegExtractAudio',
                    'audioquality': '0',
                    'preferredquality': '320',
            }]
    }
     
    with youtube_dl.YoutubeDL(ydl_options) as ydl:
        ydl.download(videos)
        

I have tried new YoutubeManager subs.xml , tried other Youtube account with different channels and their subs.xml nothing helped.

And here is my error output

runfile('C:/Users/sound/Desktop/PythonProjets/youtubesubscriptions.py', wdir='C:/Users/sound/Desktop/PythonProjets')
Traceback (most recent call last):

  File "<ipython-input-1-ff8a84b96d09>", line 1, in <module>
    runfile('C:/Users/sound/Desktop/PythonProjets/youtubesubscriptions.py', wdir='C:/Users/sound/Desktop/PythonProjets')

  File "C:\Users\sound\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 786, in runfile
    execfile(filename, namespace)

  File "C:\Users\sound\Anaconda3\lib\site-packages\spyder_kernels\customize\spydercustomize.py", line 110, in execfile
    exec(compile(f.read(), filename, 'exec'), namespace)

  File "C:/Users/sound/Desktop/PythonProjets/youtubesubscriptions.py", line 29, in <module>
    outline = opml.parse('subs.xml')

  File "C:\Users\sound\Anaconda3\lib\site-packages\opml\__init__.py", line 67, in parse
    return Opml(lxml.etree.parse(opml_url))

  File "src/lxml/etree.pyx", line 3435, in lxml.etree.parse

  File "src/lxml/parser.pxi", line 1840, in lxml.etree._parseDocument

  File "src/lxml/parser.pxi", line 1866, in lxml.etree._parseDocumentFromURL

  File "src/lxml/parser.pxi", line 1770, in lxml.etree._parseDocFromFile

  File "src/lxml/parser.pxi", line 1163, in lxml.etree._BaseParser._parseDocFromFile

  File "src/lxml/parser.pxi", line 601, in lxml.etree._ParserContext._handleParseResultDoc

  File "src/lxml/parser.pxi", line 711, in lxml.etree._handleParseResult

  File "src/lxml/parser.pxi", line 638, in lxml.etree._raiseParseError

OSError: Error reading file 'subs.xml': failed to load external entity "subs.xml"

The error shows that you dont have access to that file.
If I run print(opml.parse('subs.xml')) on my PC I get exactly the same error message. Either the path is wrong or you dont have read access to that file.

The way your code is setup means that python looks for that file in the path where you are running the .py file from.
Is subs.xml in the same folder as your python file?
One way you could try would be linking the path directly like this:
outline = opml.parse(r'C:\folder_name\subs.xml')