Cannot read properties of undefined (reading 'url')

I am getting this error in panel, no error in console except this

index.js?1652945001:9548 WebSocket connection to ‘ws://localhost:63990/’ failed:

Could you please provide more context? Is that happening with a fresh Starterkit? What is your dev environment?

It’s my development environment

title: Calculators

type: pagetable

but if I remove this section then the error disappears
and it shows
This page has no blueprint yet. You can define the setup in /site/blueprints/pages/calculators.yml

Which Kirby version are you using with which pagetable plugin version?

And again, what is your local dev environment setup?

from plugin → “name”: “kirby-pagetable”, “version”: “1.0.1”,

from composer.lock → “name”: “getkirby/cms”, “version”: “3.6.6”,

php -v 7.4.29

Folder structure →

Index.php → require ‘kirby/bootstrap.php’;

$kirby = new Kirby([
‘roots’ => [
‘content’ => ‘…/content’,

echo $kirby->render();

And what do you mean by local development environment setup?? I run with php command

Looks like you are not running the latest plugin version, compatibility with Kirby 3.6 was added from version 1.1