Using fs.readdir returns ENOENT on vps, but not on localhost

So I am working on a node js project and I want to load all files from one directory. Everything works on localhost, but when I push it to server, it throws this error:

Error: ENOENT, readdir './maps/'

The error is here (app.js):

        var dir='./maps/';
        fs.readdir(dir,function(err,files){
            if (err) throw err;
            files.forEach(function(file){
                fs.readFile(dir+file,'utf-8',function(err,data){
                    if (err) throw err;                        
                    //code..
                    }
                });
            });
        });

I triple checked the directory tree on server and it is indeed the same as on localhost, so I have no idea what's happening here.

The directory tree looks like this (both on server and localhost):

src
    app.js
    maps
        map1.json
        map2.json
    routes
        index.js
        and so on...

The server is running on amazon linux.