Custom Error Dopcument

[JuanCar]

How can I customize error pages (404, 403, 500...) in a subdomains base?

I've created a custom error page for the main domain, and when I search a missing page in main domain i get this custom error page. That¡s OK, but when I ask for a missing page in a subdomain I get too the custom error doc of main domain, although I've configure subdomain with customized error pages in Plesk.

Any suggest?

Thanks