Error: Route.get() requires a callback function but got a [object Undefined]

[ankitjain-IAM]

When I execute run.bat, I get below error:

C:\Users\ankitja\Downloads\Hello\node_modules\express\lib\router\route.js:202
throw new Error(msg);
^

Error: Route.get() requires a callback function but got a [object Undefined]
at Route. [as get] (C:\Users\ankitja\Downloads\Hello\node_modules\express\lib\router\route.js:202:15)
at Function.app. [as get] (C:\Users\ankitja\Downloads\Hello\node_modules\express\lib\application.js:482:19)
at module.exports (C:\Users\ankitja\Downloads\Hello\routes\users.js:8:9)
at Object. (C:\Users\ankitja\Downloads\Hello\server.js:26:29)
at Module._compile (internal/modules/cjs/loader.js:1137:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1157:10)
at Module.load (internal/modules/cjs/loader.js:985:32)
at Function.Module._load (internal/modules/cjs/loader.js:878:14)
at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:71:12)
at internal/main/run_main_module.js:17:47
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! sample-scim-gateway-app@1.0.0 start: node server.js
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the sample-scim-gateway-app@1.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\ankitja\AppData\Roaming\npm-cache_logs\2020-08-21T13_24_46_349Z-debug.log

[heungheung]

I tried a couple of different combinations but cannot reproduce this error. Could you please provide more info? e.g. how to reproduce, what have you done, the debug log, nodejs/npm version, etc.