我正在使用Flask框架和python制作一个web应用程序，我想让web能够上传csv，而不用保存和显示我制作的模板中的数据，我已经添加了上传和处理数据的语法，直到它在一个表视图中，但在运行网站后，它进入404未找到错误信息，我该如何修复它？我已经在www.example.com中制作了一个代码main.py

from datetime import datetime
from flask import Flask, render_template, request, session
from FlaskWebProject2 import app
import os
import pandas as pd
from werkzeug.utils import secure_filename

#*** Flask configuration
 
UPLOAD_FOLDER = os.path.join('staticFiles', 'uploads')

ALLOWED_EXTENSIONS = {'csv'}
 
app = Flask(__name__, template_folder='templateFiles', static_folder='staticFiles')

app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
 
app.secret_key = 'This is your secret key to utilize session in Flask'

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

@app.route('/upload',  methods=['POST', 'GET'])
def uploadFile():
    if request.method == 'POST':
        # upload file flask
        uploaded_df = request.files['uploaded-file']
 
        # Extracting uploaded data file name
        data_filename = secure_filename(uploaded_df.filename)
 
        # flask upload file to database (defined uploaded folder in static path)
        uploaded_df.save(os.path.join(app.config['UPLOAD_FOLDER'], data_filename))
 
        # Storing uploaded file path in flask session
        session['uploaded_data_file_path'] = os.path.join(app.config['UPLOAD_FOLDER'], data_filename)
 
        return render_template('index_upload_and_show_data_page2.html')

@app.route('/show_data')
def showData():
    # Retrieving uploaded file path from session
    data_file_path = session.get('uploaded_data_file_path', None)
 
    # read csv file in python flask (reading uploaded csv file from uploaded server location)
    uploaded_df = pd.read_csv(data_file_path)
 
    # pandas dataframe to html table flask
    uploaded_df_html = uploaded_df.to_html()
    return render_template('show_csv_data.html', data_var = uploaded_df_html)

我想网站可以显示主页和上传，阅读和显示csv数据正常工作