[Phaser-Arcade-Slopes plugin] "tilemapLayer.getTileOffsetX is not a function"

This is my first time using CE, I’ve been learning Phaser 3 for the past few months. I wanted to set up a simple CE project to try out the Phaser-Arcade-Slopes plugin, so I can compare it to handling slopes with MatterJS in P3. I followed the instructions on that page to set up my project, and I’ve been trying to follow this tutorial as well, although I don’t quite understand how he set up his convertTilemapLayer() statement.

I’m using the barebones Webpack boilerplate from the CE master branch repo’s Resources directory.

The problem shows up when I try to enable collision between the player sprite and the platform which has been converted to use the slopes plugin. If I remove the collider statement, the error goes away. The only other warning or error in the console is a source map error message, but that was there before I included the plugin. And based on my Googling on the source map error, as I understood it, the source map error shouldn’t be impacting the functioning of my game.

What could be causing this?

Here is a screenshot of the console error message.

I have the rest of my source code in this Drive folder, but here’s my index.js file so far:
import PIXI from ‘expose-loader?PIXI!phaser-ce/build/custom/pixi.js’;

import p2 from 'expose-loader?p2!phaser-ce/build/custom/p2.js';

import Phaser from 'expose-loader?Phaser!phaser-ce/build/custom/phaser-split.js';

var game = new Phaser.Game(800, 600, Phaser.AUTO, '', { preload: preload, create: create, update: update });

function preload() {

  this.game.load.tilemap('hexustiles', './assets/tilemaps/stage2-hexustiles.json', null, Phaser.Tilemap.TILED_JSON);

  this.game.load.spritesheet('tiles', './assets/images/tilesets/arcade-slopes-16.png', 16, 16);

  this.game.load.atlas('hero', './assets/spritesheets/hero.png', './assets/spritesheets/hero.json', Phaser.Loader.TEXTURE_ATLAS_JSON_HASH);


function create() {



  this.map = this.game.add.tilemap('hexustiles');

  this.tiles = this.map.addTilesetImage('arcade-slopes-16', 'tiles');

  this.platform = this.map.createLayer('hexus-tiles');

  this.map.setCollisionBetween(1, 38, true, this.platform);

  this.game.slopes.convertTilemapLayer(this.platform, 'arcadeslopes');

  this.hero = this.game.add.sprite(50, 50, 'hero', 'adventurer-idle-00-1.3');


  this.hero.body.gravity.y = 2000;




  this.controls = game.input.keyboard.createCursorKeys();

  console.log(this.game.slopes, this.platform, this.tiles);



function update() {

  this.game.physics.arcade.collide(this.hero, this.platform);