Python-TensorFlow app FileNotFoundError: [Errno 2] No such file or directory

Question

I am trying to test a simple Flask-TensorFlow Image Classifier app from docker container. The Docker containers were successfully deployed in an Ubuntu 22.10 EC2 instance. when I tried to hit /classify endpoint the following errors have given:-

web_1  | 45.248.151.224 - - [13/May/2022 20:40:33] "POST /register HTTP/1.1" 200 -
web_1  | [2022-05-13 20:43:20,706] ERROR in app: Exception on /classify [POST]
web_1  | Traceback (most recent call last):
web_1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1523, in full_dispatch_request
web_1  |     rv = self.dispatch_request()
web_1  |   File "/usr/local/lib/python3.10/site-packages/flask/app.py", line 1509, in dispatch_request
web_1  |     return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
web_1  |   File "/usr/local/lib/python3.10/site-packages/flask_restful/__init__.py", line 467, in wrapper
web_1  |     resp = resource(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.10/site-packages/flask/views.py", line 84, in view
web_1  |     return current_app.ensure_sync(self.dispatch_request)(*args, **kwargs)
web_1  |   File "/usr/local/lib/python3.10/site-packages/flask_restful/__init__.py", line 582, in dispatch_request
web_1  |     resp = meth(*args, **kwargs)
web_1  |   File "/usr/src/app/app.py", line 113, in post
web_1  |     with open('text.txt') as f:
web_1  | FileNotFoundError: [Errno 2] No such file or directory: 'text.txt'
web_1  | 45.248.151.224 - - [13/May/2022 20:43:20] "POST /classify HTTP/1.1" 500 -

Here is my app.py code:-

app.py

Platform details:-

Python-3.10.4
pymongo-4.1.1
tensorflow-2.8.0
mongo:3.6.4
Ubuntu 22.10 EC2 Instance
Docker Engine -  20.10.14

This error never raised while I run the app in MacOS or in PC(Ubuntu-20.04). Only EC2 or Virtual Box Ubuntu 22.04 has given this error. Any Work around for this issue.TIA