세줄 복사해다가 붙였는데 이렇게 나오네요 뒤에 ca를 지우니까 아예 작동을안해서요

from flask import Flask, render_template, request, jsonify
app = Flask(__name__)

from pymongo import MongoClient
client = MongoClient('mongodb+srv://test:sparta@cluster0.im2ccmy.mongodb.net/Cluster0?retryWrites=true&w=majority', tlsCAFile=ca)
db = client.dbsparta

@app.route('/')
def home():
    return render_template('index.html')

@app.route("/mars", methods=["POST"])
def web_mars_post():
    name_receive = request.form['name_give']
    address_receive = request.form['address_give']
    size_receive = request.form['size_give']

    doc = {
        'name' : name_receive,
        'address' : address_receive,
        'size' : size_receive
    }
    db.mars.insert_one(doc)

/Users/yuyeongjae/Desktop/sparta/project/marth/venv/bin/python /Users/yuyeongjae/Desktop/sparta/project/marth/app.py 

Traceback (most recent call last):

 File "/Users/yuyeongjae/Desktop/sparta/project/marth/app.py", line 5, in <module>

  client = MongoClient('mongodb+srv://test:sparta@cluster0.im2ccmy.mongodb.net/Cluster0?retryWrites=true&w=majority', tlsCAFile=ca)

NameError: name 'ca' is not defined