---
id: flow--unknown-plugin
title: "Unknown plugin"
summary: "Hidden placeholder. The designer shows it in place of a component whose plugin is no longer installed, so that the flow can still be opened and edited. It cannot be added from the toolbox."
audience: user
keywords: "input, output"
---
# Unknown plugin

Hidden placeholder. The designer shows it in place of a component whose plugin is no longer installed, so that the flow can still be opened and edited. It cannot be added from the toolbox.

## Pins

| Pin | Kind | Types | Description |
|---|---|---|---|
| Input | input | any | Keeps existing connections. |
| Output | output | same as input | Keeps existing connections. |

## Configuration

None besides the common settings.

## Behaviour

- The flow cannot run while it contains this component: initialization and execution throw "This is replacement plugin (represents currently unknown plugin) and cannot be used in the runtime".

## Notes

- Install the missing plugin again, or replace the component with an available one and reconnect its pins.