@macmanx Thank you a lot for you help. But the solution didn’t work for me. However, I have found a solution to it.
For the sake of whomever faces the same issue in future and wants to try what I did, I logged in to my WordPress dashboard, clicked on Update (When you place your mouse on Dashboard, Home and Update menus will show), from the Update page, I updated my WordPress site. Thought my site was up-to-date when the problem occurred, I forced the site to re-install WordPress. This solved my problem for me, I pray it will work for whomever comes across this in future too