# X_ROUTE_POST_INVALID

## Means

a page route's post binding cannot be mounted

## Typical cause

post: names no registered action, is not a string, or sits on a page that is not render: 'ssr'

## Fix

defineRoute({ ..., post: '<actionExportName>' }) on an ssr page, naming an action the app registers — x actions list --json prints them

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