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작성한 코드 및 에러 메세지

C:\Users\82109\Desktop\sparta\projects\pythonProject\mars\venv\Scripts\python.exe C:\Users\82109\Desktop\sparta\projects\pythonProject\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://192.168.55.96:5000

Press CTRL+C to quit

 * Restarting with stat

 * Debugger is active!

 * Debugger PIN: 657-177-803

127.0.0.1 - - [26/Jan/2023 16:00:28] "GET / HTTP/1.1" 200 -

127.0.0.1 - - [26/Jan/2023 16:00:28] "GET /mars HTTP/1.1" 200 -

127.0.0.1 - - [26/Jan/2023 16:00:32] "POST /mars HTTP/1.1" 500 -

Traceback (most recent call last):

 File "C:\Users\82109\Desktop\sparta\projects\pythonProject\mars\venv\lib\site-packages\flask\app.py", line 2548, in __call__

  return self.wsgi_app(environ, start_response)

 File "C:\Users\82109\Desktop\sparta\projects\pythonProject\mars\venv\lib\site-packages\flask\app.py", line 2528, in wsgi_app

  response = self.handle_exception(e)

 File "C:\Users\82109\Desktop\sparta\projects\pythonProject\mars\venv\lib\site-packages\flask\app.py", line 2525, in wsgi_app

  response = self.full_dispatch_request()

 File "C:\Users\82109\Desktop\sparta\projects\pythonProject\mars\venv\lib\site-packages\flask\app.py", line 1822, in full_dispatch_request

  rv = self.handle_user_exception(e)

 File "C:\Users\82109\Desktop\sparta\projects\pythonProject\mars\venv\lib\site-packages\flask\app.py", line 1820, in full_dispatch_request

  rv = self.dispatch_request()

 File "C:\Users\82109\Desktop\sparta\projects\pythonProject\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\82109\Desktop\sparta\projects\pythonProject\mars\app.py", line 19, in web_mars_post

  db.mars.insert_one(doc)

NameError: name 'db' is not defined