# Page Not Found

The URL `plumbing-copilot-learning/user-messages/valid-element-and-selection-errors` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Account and License](https://pipeit.gitbook.io/plumbing-copilot-v1/getting-started/account-and-license.md)
- [Set Obstacles and Boundaries](https://pipeit.gitbook.io/plumbing-copilot-v1/routing-workflow/set-obstacles-and-boundaries.md)
- [Select a Route](https://pipeit.gitbook.io/plumbing-copilot-v1/routing-workflow/route-selection.md)
- [Side Elements](https://pipeit.gitbook.io/plumbing-copilot-v1/routing-elements/side-elements.md)
- [Special Elements](https://pipeit.gitbook.io/plumbing-copilot-v1/routing-elements/special-elements.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://pipeit.gitbook.io/plumbing-copilot-v1/getting-started/account-and-license.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://pipeit.gitbook.io/plumbing-copilot-v1/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://pipeit.gitbook.io/plumbing-copilot-v1/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/plumbing-copilot-v1/getting-started/account-and-license.md`).

You may also use `Accept: text/markdown` header for content negotiation.