[Bug] Portainer stack error

[Creveoolus]

Describe the bug When trying to create a stack in Portainer it gives a error:

Deployment error Failed to deploy a stack: Top-level object must be a mapping

To Reproduce Steps to reproduce the behavior:

1. Go to Portainer Create stack page
2. Enter all required fields
3. Try to deploy the stack

Expected behavior All containers from docker-compose.yml should be pulled and run.

Screenshots My fields

Desktop (please complete the following information):

• OS: Ubuntu 22.04
• Browser: Firefox
• Version:

Additional context I am using Portainer CE 2.21.5 under UmbrelOS on my home server.

I tried forking the repo and adding stack.env to the repo and it didn't either.