Python Flask "The configuration file does not exist." accessing sub-path – CPanel

I am deploying Flask on CPanel, and basic configurations are working correctly,
up to the point that I can access home route, defined as:

@app.route("/home")
@app.route("/")
def home():
   return "This is home page, blah blah blah"

The site can be thought of, as being accessed at
https://sub-domain.main-domain.com/base-url,

thus, home page is accessed as https://sub-domain.main-domain.com/base-url/ and that works perfectly.

Problem

So, the issue comes when I access any other route, other than the slash("/"),
in the above example, for instance, accessing

https://sub-domain.main-domain.com/base-url/home,

doesn’t seem to work at all, and results in

The configuration file does not exist. error.

Any possible help would be kindly appreciated. my passenger_wsgi.py is configured as:

import sys

# add your project directory to the sys.path
base_dir = u'/home/cpaneusername/base-dir'
if base_dir not in sys.path:
    sys.path = [base_dir] + sys.path

# import flask app but need to call it "application" for WSGI to work
from app import website as application

Nevertheless, thanks for the assistance.