DiscordPHP will not run on a webserver. Please use PHP CLI to run a DiscordPHP bot.

[blackfoxdeveloper]

I add step by step notification and after enter to page (page test notification) i see that error. Command in CLI i run

 php artisan discord:setup

 Is the bot already added to your server? (yes/no) [no]:
 > 

 What is your Discord app client ID?:
 > *********************

Add the bot to your server by visiting this link: https://discord.com/oauth2/authorize?&client_id=******************&scope=bot&permissions=0

 Continue? (yes/no) [yes]:
 > yes

Attempting to identify the bot with Discord's websocket gateway...
Connecting to 'wss://gateway.discord.gg'...
Your bot has been identified by Discord and can now send API requests!

Crush on line
app(Discord::class)->getPrivateChannel($discordId); //$discordId = discord_user_id