---
page_type: error
code: 50406
message: "50406: Programmable Chat: Invalid last consumed message index format"
level: ERROR
product: Programmable Chat
---

## Error - 50406

### Programmable Chat: Invalid last consumed message index format

#### Possible Causes

- Request does not contain correctly formatted parameter for last consumed message index

#### Possible Solutions

- Confirm a valid parameter is passed in request.