> ## Documentation Index
> Fetch the complete documentation index at: https://docs.meridian.surf/llms.txt
> Use this file to discover all available pages before exploring further.

# Post flow error card

> Trigger runtime flow errors to test error handling. Meridian team only.

The **Post flow error card** block lives in the **Developer** palette category. Trigger runtime flow errors to test error handling. Meridian team only.

This block is only visible to Meridian team accounts in the builder palette.

## What it does

Intentionally triggers a runtime flow error card in Discord to test error handling UX.

## Configuration

Open the block in the builder sidebar to configure these fields.

### `highlight_target`

**Type:** `block-reference`. Required.

Block highlighted when users click Highlight in Discord.

### `error_detail`

**Type:** `string`.

Code-style error body text.

### `destination`

**Type:** `string`.

Where the error card appears. Accepted values: `current`, `channel`.

## Important

* Meridian team palette only. Do not use in production user flows.

## See also

* [Developer](/builder/action-blocks/developer) — Browse all blocks in the Developer category.