JS Callback issue

m_logic_n.append_custom_callback("change", change_cb);

"use strict"

// register the application module
b4w.register("my_project_main", function(exports, require) {

// import modules used by the app
var m_app       = require("app");
var m_cfg       = require("config");
var m_data      = require("data");
var m_preloader = require("preloader");
var m_ver       = require("version");


// MY REQUIRE
var m_logic_n   = require("logic_nodes");
// MY REQUIRE



// detect application mode
var DEBUG = (m_ver.type() == "DEBUG");

// automatically detect assets path
var APP_ASSETS_PATH = m_cfg.get_assets_path("my_project");

/**
 * export the method to initialize the app (called at the bottom of this file)
 */
exports.init = function() {
    m_app.init({
        canvas_container_id: "main_canvas_container",
        callback: init_cb,
        show_fps: DEBUG,
        console_verbose: DEBUG,
        autoresize: true
    });
}

/**
 * callback executed when the app is initialized 
 */
function init_cb(canvas_elem, success) {

    if (!success) {
        console.log("b4w init failure");
        return;
    }

    m_preloader.create_preloader();

    // ignore right-click on the canvas element
    canvas_elem.oncontextmenu = function(e) {
        e.preventDefault();
        e.stopPropagation();
        return false;
    };
    
    
    
// MY CUSTOM CALLBACK - THIS IS WHERE THE MAIN ERROR IS BEING CALLED. 'change' IS  THE VARIABLE ID ON MY NODE 
// NOT SURE IF IT'S A PROBLEM WITH MY BRACES OR SEMI COLONS 

m_logic_n.append_custom_callback("change", change_cb);
 



    load();
}

/**
 * load the scene data
 */
function load() {
    m_data.load(APP_ASSETS_PATH + "my_project.json", load_cb, preloader_cb);
}

/**
 * update the app's preloader
 */
function preloader_cb(percentage) {
    m_preloader.update_preloader(percentage);
}

/**
 * callback executed when the scene data is loaded
 */
function load_cb(data_id, success) {

    if (!success) {
        console.log("b4w load failure");
        return;
    }

    m_app.enable_camera_controls();

    // place your code here

// MY CUSTOM FUNCTION 
    function change_cb(in_params, out_params) {
        document.getElementById("OverlayOne").style.display = "block";
// MY CUSTOM FUNCTION
    }
    
    
}


});

// import the app module and start the app by calling the init method
b4w.require("my_project_main").init();

function load_cb(data_id, success) {

     	if (!success) {
     		console.log("b4w load failure");
     		return;
     	}

     	m_app.enable_camera_controls();

     }//this is the closing brace for load_cb
     function change_cb(in_params, out_params) {
     	console.log("My Callback Works!")
        //document.getElementById("OverlayOne").style.display = "block";
    
}

function load_cb(data_id, success) {

    if (!success) {
        console.log("b4w load failure");
        return;
    }

    m_app.enable_camera_controls();

    // place your code here

// MY CUSTOM FUNCTION 
    function change_cb(in_params, out_params) {
        document.getElementById("OverlayOne").style.display = "block";
// MY CUSTOM FUNCTION
    }
    
    
}

"use strict"

// register the application module
b4w.register("showDiv_main", function (exports, require) {

    // import modules used by the app
    var m_app = require("app");
    var m_cfg = require("config");
    var m_data = require("data");
    var m_preloader = require("preloader");
    var m_ver = require("version");
    var m_logn = require("logic_nodes");

    // detect application mode
    var DEBUG = (m_ver.type() == "DEBUG");

    // automatically detect assets path
    var APP_ASSETS_PATH = m_cfg.get_assets_path("showDiv");

    /**
     * export the method to initialize the app (called at the bottom of this file)
     */
    exports.init = function () {
        m_app.init({
            canvas_container_id: "main_canvas_container",
            callback: init_cb,
            show_fps: DEBUG,
            console_verbose: DEBUG,
            autoresize: true
        });
    }

    /**
     * callback executed when the app is initialized 
     */
    function init_cb(canvas_elem, success) {

        if (!success) {
            console.log("b4w init failure");
            return;
        }

        m_preloader.create_preloader();

        // ignore right-click on the canvas element
        canvas_elem.oncontextmenu = function (e) {
            e.preventDefault();
            e.stopPropagation();
            return false;
        };

        console.log("showDiv_cb will be append");
        console.log(showDiv_cb);

        m_logn.append_custom_callback("showDiv", showDiv_cb);


        load();
    }

    /**
     * load the scene data
     */
    function load() {
        m_data.load(APP_ASSETS_PATH + "showDiv.json", load_cb, preloader_cb);
    }

    /**
     * update the app's preloader
     */
    function preloader_cb(percentage) {
        m_preloader.update_preloader(percentage);
    }

    /**
     * callback executed when the scene data is loaded
     */
    function load_cb(data_id, success) {

        if (!success) {
            console.log("b4w load failure");
            return;
        }

        m_app.enable_camera_controls();

       var display_div = document.createElement("div");
    display_div.id = "display_div_id";
    display_div.style.position = "relative";
	display_div.style.color = "green";
	display_div.style.fontSize = "30px";
	display_div.style.fontFamily = "sans-serif";
	display_div.style.fontWeight = "900";
    display_div.innerHTML = "Click the cube to change inner HTML of this div";
    document.body.appendChild(display_div);

    }

    function showDiv_cb(in_params, out_params) {
        console.log("showDiv_cb was called!");
var anchor_elem = document.getElementById("display_div_id");
	anchor_elem.innerHTML = "It worked";
    }

});

// import the app module and start the app by calling the init method
b4w.require("showDiv_main").init();