* 겪고 있는 문제 상황을 최대한 자세하게 작성해주세요.

* 문제 해결을 위해 어떤 시도를 해보았는지 구체적으로 함께 알려주세요.

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


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


if __name__ == '__main__':  
    app.run(debug=True

위 코드를 app.py에 저장하고, 터미널에서 python app.py로 실행까지는 괜찮습니다.

다만, http://127.0.0.1:5000/주소에 접근 시 오류가 발생합니다.

현재 가상환경 인터프리터는 python 3.12.0입니다.

강사님의 버전인 3.8.6으로 실행 시 return render_template('index.html) 전 단계인 return 'This is Home!'부터 오류가 발생합니다.

작성한 코드 및 에러 메세지

터미널 내용은 다음과 같습니다.

hjn50@□□□□2 MINGW64 ~/Desktop/sparta/FlaskPython3.12
$ python 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 http://127.0.0.1:5000
Press CTRL+C to quit
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 592-966-765
127.0.0.1 - - [03/Feb/2024 16:57:30] "GET / HTTP/1.1" 500 -
Traceback (most recent call last):
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\app.py", line 1488, in __call__
    return self.wsgi_app(environ, start_response)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\app.py", line 1466, in wsgi_app
    response = self.handle_exception(e)
               ^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\app.py", line 1463, in wsgi_app
    response = self.full_dispatch_request()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\app.py", line 872, in full_dispatch_request
    rv = self.handle_user_exception(e)
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\app.py", line 870, in full_dispatch_request
    rv = self.dispatch_request()
         ^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\app.py", line 855, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args)  # type: ignore[no-any-return]
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\app.py", line 6, in home
    return render_template('index.html')
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\templating.py", line 149, in render_template
    template = app.jinja_env.get_or_select_template(template_name_or_list)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.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\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\jinja2\environment.py", line 1010, in get_template
    return self._load_template(name, globals)
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\templating.py", line 65, in get_source
    return self._get_source_fast(environment, template)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\templating.py", line 65, in get_source
    return self._get_source_fast(environment, template)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\hjn50\Desktop\sparta\FlaskPython3.12\.venv\Lib\site-packages\flask\templating.py", line 99, in _get_source_fast
    raise TemplateNotFound(template)
jinja2.exceptions.TemplateNotFound: index.html
127.0.0.1 - - [03/Feb/2024 16:57:31] "GET /?__debugger__=yes&cmd=resource&f=style.css HTTP/1.1" 304 -
127.0.0.1 - - [03/Feb/2024 16:57:31] "GET /?__debugger__=yes&cmd=resource&f=debugger.js HTTP/1.1" 304 -
127.0.0.1 - - [03/Feb/2024 16:57:31] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 304 -
127.0.0.1 - - [03/Feb/2024 16:57:31] "GET /?__debugger__=yes&cmd=resource&f=console.png HTTP/1.1" 304 -