Invalid Environment Variable

:::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.:::

EnvInvalidVariable: The following environment variable does not match the data type and/or properties defined in experimental.env.schema: KEY is not of type TYPE

What went wrong?

An environment variable does not match the data type and/or properties defined in experimental.env.schema.