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index파일을 찾지 못하는 것 같아요

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* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

작성한 코드 및 에러 메세지

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

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

@app.route("/mars", methods=["POST"])
def web_mars_post():
    sample_receive = request.form['sample_give']
    print(sample_receive)
    return jsonify({'msg': 'POST 연결 완료!'})

@app.route("/mars", methods=["GET"])
def web_mars_get():
    return jsonify({'msg': 'GET 연결 완료!'})

if __name__ == '__main__':
   app.run('0.0.0.0', port=5000, debug=True)

<에러 메세지>

C:\Users\나\Desktop\sparta\project\mars\venv\Scripts\python.exe C:\Users\나\Desktop\sparta\project\mars\app.py

* Serving Flask app 'app'

* Debug mode: on

WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead.

* Running on all addresses (0.0.0.0)

* Running on http://127.0.0.1:5000

* Running on http://172.30.1.40:5000

Press CTRL+C to quit

* Restarting with stat

* Debugger is active!

* Debugger PIN: 340-410-326

127.0.0.1 - - [27/Jan/2023 20:54:00] "GET / HTTP/1.1" 500 -

Traceback (most recent call last):

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\app.py", line 2548, in __call__

return self.wsgi_app(environ, start_response)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\app.py", line 2528, in wsgi_app

response = self.handle_exception(e)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\app.py", line 2525, in wsgi_app

response = self.full_dispatch_request()

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\app.py", line 1822, in full_dispatch_request

rv = self.handle_user_exception(e)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\app.py", line 1820, in full_dispatch_request

rv = self.dispatch_request()

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\app.py", line 1796, in dispatch_request

return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)

File "C:\Users\나\Desktop\sparta\project\mars\app.py", line 6, in home

return render_template('index.html')

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\templating.py", line 146, in render_template

template = app.jinja_env.get_or_select_template(template_name_or_list)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\jinja2\environment.py", line 1081, in get_or_select_template

return self.get_template(template_name_or_list, parent, globals)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\jinja2\environment.py", line 1010, in get_template

return self._load_template(name, globals)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\jinja2\environment.py", line 969, in _load_template

template = self.loader.load(self, name, self.make_globals(globals))

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\jinja2\loaders.py", line 126, in load

source, filename, uptodate = self.get_source(environment, name)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\templating.py", line 62, in get_source

return self._get_source_fast(environment, template)

File "C:\Users\나\Desktop\sparta\project\mars\venv\lib\site-packages\flask\templating.py", line 98, in _get_source_fast

raise TemplateNotFound(template)

jinja2.exceptions.TemplateNotFound: index.html

127.0.0.1 - - [27/Jan/2023 20:54:00] "GET /?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 304 -

127.0.0.1 - - [27/Jan/2023 20:54:00] "GET /?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 304 -

127.0.0.1 - - [27/Jan/2023 20:54:00] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 304 -

127.0.0.1 - - [27/Jan/2023 20:54:44] "GET / HTTP/1.1" 500 -