All error codes

network_is_default

HTTP 409 The default network cannot be deleted

What happened

You asked to delete the project's default network. It is created together with the project and every project keeps one.

What to do

Leave it in place - it can be renamed, and any other network you created can be deleted normally.

Retrying

Repeating this request will not help.

How it arrives

{
    "type": "https://docs.fiberax.com/errors/network_is_default",
    "title": "The default network cannot be deleted",
    "status": 409,
    "code": "network_is_default",
    "request_id": "a277dcd1ca652c65"
}

Branch your code on code, never on the wording of title.