throw new TypeError('Router.use() requires a middleware function')

[TemeBirhanu]

something wrong with the use of router if you understand i need fast response
[nodemon] starting node server.js
D:\Program Files\Mern\exercise-tracker\backend\node_modules\express\lib\router\index.js:462
throw new TypeError('Router.use() requires a middleware function')
^

TypeError: Router.use() requires a middleware function
at Function.use (D:\Program Files\Mern\exercise-tracker\backend\node_modules\express\lib\router\index.js:462:11)
at Object. (D:\Program Files\Mern\exercise-tracker\backend\routes\users.js:4:8)
at Module._compile (node:internal/modules/cjs/loader:1376:14)
at Module._extensions..js (node:internal/modules/cjs/loader:1435:10)
at Module.load (node:internal/modules/cjs/loader:1207:32)
at Module._load (node:internal/modules/cjs/loader:1023:12)
at Module.require (node:internal/modules/cjs/loader:1235:19)
at require (node:internal/modules/helpers:176:18)
at Object. (D:\Program Files\Mern\exercise-tracker\backend\server.js:21:21)
at Module._compile (node:internal/modules/cjs/loader:1376:14)

Node.js v20.11.0
[nodemon] app crashed - waiting for file changes before starting...