Content collection frontmatter invalid.

import DontEditWarning from '~/components/DontEditWarning.astro'

<DontEditWarning />

:::caution[Deprecated] This error is from an older version of Astro and is no longer in use. If you are unable to upgrade your project to a more recent version, then you can consult unmaintained snapshots of older documentation for assistance. :::

Example error message:

Could not parse frontmatter in blog → post.md

"title" is required.

"date" must be a valid date.

What went wrong?

A Markdown document's frontmatter in src/content/ does not match its collection schema. Make sure that all required fields are present, and that all fields are of the correct type. You can check against the collection schema in your src/content/config.* file. See the Content collections documentation for more information.