# studio-unknown-item

> A row uses a trigger, condition or action the Studio does not know, or a row has no trigger.

| | |
| --- | --- |
| Kind | Studio problem |
| Reported by | Studio validation: the Problems panel, Play, Publish and the MCP `validate` tool |
| Code in the Studio | `unknown-item` |

Rows name vocabulary items by id. An item from a newer Studio, a typo in a project built by hand or through MCP, or a row created without a trigger produces this problem.

## Fix

- Pick a trigger for the row in the Events page.
- Replace the unknown item with one from the [vocabulary](/reference/studio-events).

## See also

- [Problems and validation](/studio/playtesting)