How to get filename from multiple directories using fs in nodejs?

I want to get file information from all the directories once i have that i have further implementation of code, but i am stuck here and getting error that is pasted in question any idea what is implemented wrong in below code ?

cron.js

var fs = require('fs');
var path = require('path');
var async = require('async');
var directories = ['./logs/dit', './logs/st','./logs/uat']
function cronJob() {
directories.forEach(function(dir){
    var files = fs.readdir(dir);
    async.eachSeries(files, function(file,callback) {
            var filePath = path.join(dirPath, file);
            var fileInfo = {};
            fs.stat(filePath, function(err, stats) {
               if (err) {
                 console.info("File doesn't");
                } else {
                 fileInfo.fileDate = stats.birthtime;
                 fileInfo.filename = file;
                 console.log(fileInfo);
//                 compareDates(fileInfo,filePath);
//                 callback();
               }
            });
        });
})

}

cronJob();

Error

s\Ulog-0\ulog\app\serverfiles\logs\dit'
  at Error (native)
  at Object.fs.readdirSync (fs.js:808:18)
  at C:\Users\WebstormProjects\Ulog-0\ulog\app\serverfiles\cronJob
20
  at Array.forEach (native)
  at cronJob (C:\Users\WebstormProjects\Ulog-0\ulog\app\serverfile
obs.js:7:13)
  at Object.<anonymous> (C:\Users\\WebstormProjects\Ulog-0\ulog\app

via hussain