node.js: TypeError: Router.use() requires a middleware function but got a Object

>PROBLEM

Running node.js/express application, returns error:

TypeError: Router.use() requires a middleware function but got a Object


>SOLUTION

Go to the router files and check if module.export sttm is present.
Example:

module.exports = router;

>ENV

node.js v12.4.0
Express
Windows 10