The error suggests that you're trying to mount a file (Caddyfile) onto a directory or vice versa. Let's debug this step by step.

Steps to Fix:

1. Check if the path exists and is correct Run:

   ls -ld /home/Joe/container/caddy/Caddyfile
   

   • If it’s a directory, it should be a file instead.
   • If it doesn’t exist, create an empty one:

     touch /home/Joe/container/caddy/Caddyfile
     

2. Ensure correct permissions

   chmod 644 /home/Joe/container/caddy/Caddyfile
   

3. Check YAML Formatting
   Your docker-compose.yml seems to have incorrect indentation and improper quotes around version. Here's a fixed version:

   version: "3.3"
   
   networks:
     caddy:
   
   services:
     portainer:
       image: portainer/portainer-ce:latest
       container_name: portainer2
       restart: unless-stopped
       security_opt:
         - no-new-privileges:true
       volumes:
         - /etc/localtime:/etc/localtime:ro
         - /var/run/docker.sock:/var/run/docker.sock:ro
         - /home/Joe/containers/portainer/portainer-data:/data
       networks:
         - caddy
       ports:
         - 9000:9000
   
     caddy:
       image: caddy:latest
       restart: unless-stopped
       container_name: caddy
       ports:
         - 80:80
         - 443:443
       volumes:
         - /home/Joe/container/caddy/Caddyfile:/etc/caddy/Caddyfile
         - /home/Joe/container/caddy/site:/srv
         - /home/Joe/container/caddy/caddy_data:/data
         - /home/Joe/container/caddy/caddy_config:/config
       networks:
         - caddy
   

4. Restart Docker and Try Again

   docker compose down
   docker compose up -d
   

If the error persists, check docker logs caddy for additional hints.