This Code is for a simple Traffic Light, now when running it on the Beaglebone black I receive the warning:"warning: single argument callbacks will be deprecated.please use node-style error-first callbacks: callback(err,response)". I am unsure of how do do what its asking in my code any help would be appreciated.

var b = require('bonescript');

var red = "p8_13";
var yellow = "p8_15";
var green = "P8_17";
var inputPin = "P8_10";

var switchstatus =0;

b.pinMode(red,b.OUTPUT);
b.pinMode(yellow,b.OUTPUT);
b.pinMode(green,b.OUTPUT);
b.pinMode(inputPin,b.OUTPUT);

var on = b.HIGH;
var off = b.LOW;

setInterval(check,200);

function check(){
    b.digitalRead(inputPin, checkButton);
    }

function checkButton(x){
    if (x.value == 1){
        switchstatus++;
        switch (switchstatus){
            case 1: setTimeout(function
              (){b.digitalWrite(red,on);
                 b.digitalWrite(yellow,off);
                 b.digitslWrite(green,off);},500);
            break;
        case 2: setTimeout (function
              (){b.digitalWrite(yellow,on);},500);
             break;
        case 3: setTimeout (function
              (){b.digitalWrite(red,off);
            b.digitalWrite(green,on);},500);
             break;
        case 4: setTimeout (function
              (){b.digitalWrite(yellow,on)
                 b.digitalWrite(green, on);},500);
             break;
            default: swtchstatus = 0;
            break;
        }
        }
        else if (switchstatus >=5){
            switchstatus = 0;
            }
        }