We set up an automated action to post a message in the general chat whenever an opportunity moves to the Invoice Paid | Won stage in CRM. However, it’s not working as expected it gives me error:

Could you help us check what the issue might be and how to resolve it?

Here’s what was done:

1. Enabled Developer Mode.
2. Created an automated action under Settings → Technical → Automated Actions with the following details:
   • Model: CRM Lead/Opportunity (crm.lead)
   • Trigger: On Update
   • Field: Stage ID → Changed to "Invoice Paid | Won"
   • Action To Do: Execute Python Code

The Python script used:

channel = env['mail.channel'].search([('name', '=', 'general')], limit=1)
if channel:
    message_body = f"TEST 🎉 A new deal has been won! {record.name} is now in the 'Invoice Paid | Won 🎖' stage! 🚀"
    channel.message_post(body=message_body, subtype_xmlid="mail.mt_comment")

Can someone have idea what might be causing the issue and how to fix it?
Thanks