Unable to resolve Permission Error - Python and AWS EB

I created a Dash application that has been deployed to AWS Elastic Beanstalk. The application relies on the user uploading an Excel sheet to get the desired output.

In another Dash application I created previously, there were no problems while uploading the Excel sheet. This time around, I keep getting a PermissionError(13, 'Permission Denied') message.

The platform for my Dash applications are Python. Unfortunately, I haven't been able to see anyone else facing the same problem too.

Just for reference, the value of the PYTHONPATH environment property is "/var/app/venv/staging-LQM1lest/bin".

Moreover, I am using the EB management console and not the CLI.

Any tips on how to solve the problem would be much appreciated.

Thanks.