Converting py file to exe: ModuleNotFoundError: No module named 'configparser'

Question

I have a python program which I converted to an exe file using pyinstaller. The python version works fine however when I run the exe version, I get this error:

   ModuleNotFoundError: No module named 'configparser'
   [15800] Failed to execute script 'main' due to unhandled exception!
 

Now I have checked this answer and tried :

• installing configParser
• using sudo python3 -m pip install mysql-connector
• pip install mysqlclient

and non solved the issue. What could I be doing wrong? and if it gets solved and I convert it to exe, would the packages work in the exe file?

Would Appreciate any insight.