Thank You David,
As you correctly identified, somebody had uninstalled it.
I think I will take backup of existing courses and then import them back in a fresh installation. Rather than going for this non-standard solution. The moodle has only 4 courses till now, so it would be easier that way.
But I would try to attempt this non-standard solution in my local moodle and see how it is behaving. This may help in some future troubleshooting