Need help with 3 errors when running script

[pythoncoder999]

So I got this bot script for reddit that I want to use for some automation for my business, it works up to the point of login to reddit user but fails at sending message, I get these 3 errors:


Config.py contents:(fill in apostophies with apropriate info)

username    = ' ' #reddit username of your account
password            = ' ' #reddit password of your account
messagesfile        = 'example.txt ' #file with messages 1 per line
usersfile           = 'example2.txt ' #file with users to DM 1 per line 

The two txt files contain messages and test user.

---

Now this is the code main python file:

import time
import string
import requests
from bs4 import BeautifulSoup
import sys
from random import randint
from config import *

def redditlogin(username, password,c):

    USER                = username
    PASSWD              = password
    API_TYPE            = 'json'
    OP                  = 'login-main'
    RENDERSTYLE         = 'html'
    ACTION              = 'sub'

    loginpost           = 'https://www.reddit.com/api/login/'+USER
    homeurl             = 'https://www.reddit.com'


    print ("[+]Logging in as "+USER+"...")
    login_data = dict(user = USER, passwd = PASSWD, api_type = API_TYPE, op = OP)
    login = c.post(loginpost, data=login_data, headers={'User-Agent':"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36","x-requested-with":'XMLHttpRequest','referer':'https://www.reddit.com','origin':'https://www.reddit.com'})

    if 'reddit_session' in str(login.headers):
        print ('[+]Successfully logged into account '+USER)
    else:
        print ('[-]Could not login')


def sendmessages(userslist, messagelist,c):

    USER_LIST           = []
    MESSAGE_LIST        = []

    for line in messagelist.readlines():
                message = line.strip('\n')
                MESSAGE_LIST.append(message)

    for line in userslist.readlines():
        user = line.strip('\n')
        USER_LIST.append(user)

    for user in USER_LIST:
        MESSAGERECIEVER = user
        SELECTION = (randint(0,len(MESSAGE_LIST)-1))
        MESSAGE_TEXT = MESSAGE_LIST[SELECTION]

        print ("[+]Messaging user "+user+ " with " +MESSAGE_TEXT)
        #print "[+]Retrieving http://reddit.com/u/" +MESSAGERECIEVER
        r = c.get('http://reddit.com/u/'+MESSAGERECIEVER,headers={'User-Agent':"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36","x-requested-with":'XMLHttpRequest','referer':'https://www.reddit.com','origin':'https://www.reddit.com'}).content
        soup = BeautifulSoup(r,'html.parser')
        MODHASH = soup.find('input',{'name':'uh'})['value']
        REDDIT_SESSION = c.cookies['reddit_session']

        params = (
            ('app', 'res'),
                )

        data = [
            ('api_type', 'json'),
            ('from_sr', ''),
            ('subject', 'twqfqawfct'),
            ('text',MESSAGE_TEXT),
            ('to', MESSAGERECIEVER),
                ]

        sendrequest = c.post('https://www.reddit.com/api/compose', headers={'User-Agent':"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36","x-requested-with":'XMLHttpRequest','referer':'https://www.reddit.com','origin':'https://www.reddit.com','x-modhash':MODHASH,'reddit_session':REDDIT_SESSION}, params=params, data=data)

def main():
    with requests.session() as c:

        try:
            userslist = open(usersfile,'r')
        except IOError:
            sys.exit("[-]Invalid user list!")

        try:
            messagelist = open(messagesfile,'r')
        except IOError:
            sys.exit("[-]Invalid message list!")

        redditlogin(username,password,c)
        sendmessages(userslist,messagelist,c)


if __name__ == '__main__':
    main()

All help is much apreciated. I am not experienced with python if anyone could help me get this script working