# X_ROUTE_NAVIGATION_INVALID

## Means

a route's navigation is not 'prefetch', 'document', 'modal' or { modal: true, prefetch: 'intent' }, or its surface has no client navigation

## Typical cause

`navigation` set to any other value — an object with any other key or value, `{ modal: true }` alone included (that is `'modal'`) — or set on a page under a surface `app.config.ts`'s `navigation.client` does not list — no router runs there, so the key would decide nothing. The second half is refused at boot

## Fix

defineRoute({ ..., navigation: 'prefetch' \| 'document' \| 'modal' \| { modal: true, prefetch: 'intent' } }) on a page whose surface is listed in app.config.ts navigation.client, or remove the key

[Routes, render and budgets](/error-codes#routes-render-and-budgets)