Error: Cannot find module './api/tracker/tracker.routes'

hi everyone!
im trying to upload my application to heroku,
after pushing the code to heroku i get this msg in the log:

Cannot find module './api/tracker/tracker.routes'

this is the correct route for the file,
the server.js is in the root
in the root there is a backend folder / api folder / tracker folder / the file - tracker.routes

so i checked if the route is correct in the the terminal - this is what i got.
the route is correct but there is some issues with const express = require(‘express’);

heroku bash backend/api/tracker/tracker.routes.js
backend/api/tracker/tracker.routes.js: line 1: syntax error near unexpected token `('
backend/api/tracker/tracker.routes.js: line 1: `const express = require('express');

so i run npm i express again.
same error.
Cannot find module ‘./api/tracker/tracker.routes’…
what should i do?

FULL ERROR


2020-05-07T11:50:41.364387+00:00 app[web.1]: 
2020-05-07T11:50:41.364404+00:00 app[web.1]: > app@1.0.0 start /app
2020-05-07T11:50:41.364407+00:00 app[web.1]: > node server.js
2020-05-07T11:50:41.364407+00:00 app[web.1]: 
2020-05-07T11:50:42.184624+00:00 app[web.1]: internal/modules/cjs/loader.js:638
2020-05-07T11:50:42.184660+00:00 app[web.1]: throw err;
2020-05-07T11:50:42.184661+00:00 app[web.1]: ^
2020-05-07T11:50:42.184661+00:00 app[web.1]: 
2020-05-07T11:50:42.184662+00:00 app[web.1]: Error: Cannot find module '../backend/api/tracker/tracker.routes.js'
2020-05-07T11:50:42.184662+00:00 app[web.1]: at Function.Module._resolveFilename (internal/modules/cjs/loader.js:636:15)
2020-05-07T11:50:42.184663+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:562:25)
2020-05-07T11:50:42.184663+00:00 app[web.1]: at Module.require (internal/modules/cjs/loader.js:692:17)
2020-05-07T11:50:42.184663+00:00 app[web.1]: at require (internal/modules/cjs/helpers.js:25:18)
2020-05-07T11:50:42.184664+00:00 app[web.1]: at Object.<anonymous> (/app/server.js:26:22)
2020-05-07T11:50:42.184664+00:00 app[web.1]: at Module._compile (internal/modules/cjs/loader.js:778:30)
2020-05-07T11:50:42.184684+00:00 app[web.1]: at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
2020-05-07T11:50:42.184684+00:00 app[web.1]: at Module.load (internal/modules/cjs/loader.js:653:32)
2020-05-07T11:50:42.184685+00:00 app[web.1]: at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
2020-05-07T11:50:42.184685+00:00 app[web.1]: at Function.Module._load (internal/modules/cjs/loader.js:585:3)
2020-05-07T11:50:42.215404+00:00 app[web.1]: npm ERR! code ELIFECYCLE
2020-05-07T11:50:42.216693+00:00 app[web.1]: npm ERR! errno 1
2020-05-07T11:50:42.218608+00:00 app[web.1]: npm ERR! app@1.0.0 start: `node server.js`
2020-05-07T11:50:42.219493+00:00 app[web.1]: npm ERR! Exit status 1
2020-05-07T11:50:42.220802+00:00 app[web.1]: npm ERR!
2020-05-07T11:50:42.223147+00:00 app[web.1]: npm ERR! Failed at the app@1.0.0 start script.
2020-05-07T11:50:42.224154+00:00 app[web.1]: npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
2020-05-07T11:50:42.236512+00:00 app[web.1]: 
2020-05-07T11:50:42.236786+00:00 app[web.1]: npm ERR! A complete log of this run can be found in:
2020-05-07T11:50:42.236964+00:00 app[web.1]: npm ERR!     /app/.npm/_logs/2020-05-07T11_50_42_226Z-debug.log
2020-05-07T11:50:42.348319+00:00 heroku[web.1]: State changed from starting to crashed
2020-05-07T11:50:43.407470+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/" host=BLABLA.herokuapp.com request_id=2bc1fff5-2097-4f79-97d1-be60b156ba8d fwd="77.124.82.234" dyno= connect= service= status=503 bytes= protocol=https
2020-05-07T11:50:44.281945+00:00 heroku[router]: at=error code=H10 desc="App crashed" method=GET path="/favicon.ico" host=BLABLA.herokuapp.com request_id=48d4c0cd-55b1-424b-9b3d-cdfd043a8a0a fwd="77.124.82.234" dyno= connect= service= status=503 bytes= protocol=https