So I was making a bot, a Reddit bot, that is going to live on Heroku, but as of deployment, problem arise. The build went smoothly, until I was going to view the app, Application Error shows up. As it turns out, I got OSError: [Errno 98] Address already in use, but everything was running smoothly on my Python shell. Here is my code + structure:

app.py:

import praw
import Levenshtein
import os
from bs4 import BeautifulSoup as bs
import requests
def g(url):
    r = requests.get(url)
    if r.status_code == 404:
        raise Exception
    page = r.text
    
    soup=bs(page,'html.parser')
    
    soup = soup.find('ul',{'class':'music_list clearfix'})
    
    soup = soup.find_all('li')
    
    return [[i.find('a')['href'],i.find('p').contents[0],i.find('h3').contents[0]] for i in soup]
def k():
    h = 1
    l = []
    while 1:
        try:
            l+=g('https://hololive.hololivepro.com/en/music?paged=%d' % h)
            h+=1
        except:
            break
    return l
from flask import Flask
from threading import Thread

app = Flask('')

@app.route('/')
def home():
    return "Server Alive!"

def run():
  app.run(host='localhost',port=8080)

def keep_alive():
    t = Thread(target=run)
    t.start()
reddit = praw.Reddit(
    client_id="******",
    client_secret="*******",
    user_agent="web:mv_bot:v0.1 (by u/khang1411)",
    username="khang1411_bot",
    password='*******',
)
def comp(w1,w2):
  w2 = w2.lower()
  w1 = w1.lower()
  if w1 in w2:
    return 1
  w2 = ''.join(ch for ch in w2 if ch.isalnum() or ch == ' ')
  w1 = ''.join(ch for ch in w1 if ch.isalnum() or ch == ' ')
  l = 0
  for i in w2.split():
    j = Levenshtein.ratio(w1,i)
    if j>l:
      l=j
  j = Levenshtein.ratio(w1,w2)
  if j > l:
    l = j
  return l
def form(l,mode,other):
  if mode == 'author':
    return ('These are the songs that matched the author %s: \n\n' % other) +  '\n\n'.join(l) + '\n\n' + '^(This comment is made by a bot, if you have improvements/complaints please contact u/khang1411)'
  elif mode == 'title':
    return ('These are the songs that matched the title %s: \n\n' % other) +  '\n\n'.join(l) + '\n\n' + '^(This comment is made by a bot, if you have improvements/complaints please contact u/khang1411)'
def fromauthor(author):
  
  w = ['%s by %s at link %s' % (l[2],l[1],l[0]) for l in k() if comp(author,l[1]) > 0.85]
  return w
def fromtitle(title):
  w=  ['%s by %s at link %s' % (l[2],l[1],l[0]) for l in k() if comp(title,l[2]) > 0.85]
  return w
if __name__ == '__main__':
    keep_alive()
    subreddit = reddit.subreddit("test")
    for comment in subreddit.stream.comments(skip_existing=True):
      print(comment.body)
      if '!mv' in comment.body:
        try:
          if comment.body.split()[1] == 'author':
            comment.reply(form(fromauthor(' '.join(comment.body.split()[2:])),'author',' '.join(comment.body.split()[2:])))
              #comment.reply()
          elif comment.body.split()[1]=='title':
            comment.reply(form(fromtitle(' '.join(comment.body.split()[2:])),'title',' '.join(comment.body.split()[2:])))
        except:
          pass

The pip file + pipfile.lock was from pipenv,

Procfile:

web: gunicorn app:app 

Requirements.txt:

beautifulsoup4==4.9.3
certifi==2021.5.30
charset-normalizer==2.0.4
click==8.0.1
colorama==0.4.4
Flask==2.0.1
gunicorn==20.1.0
idna==3.2
itsdangerous==2.0.1
Jinja2==3.0.1
Levenshtein==0.13.0
MarkupSafe==2.0.1
praw==7.4.0
prawcore==2.3.0
requests==2.26.0
soupsieve==2.2.1
update-checker==0.18.0
urllib3==1.26.6
websocket-client==1.2.1
Werkzeug==2.0.1

Runtime.txt:

python-3.9.4

Running it on Repl.it and the Python shell works, but not on Heroku.

P/S: I deployed the Heroku app through GitHub, this is the image:

I tried to change the host and the port, but not working. How can I fix this? Thanks,

P/S 2: Log: https://pastebin.com/CmhpWXTW