---
page_type: error
code: 55555
message: "55555: Invalid Instruction passed to TaskRouter"
level: ERROR
product: TaskRouter
---

## Description

An invalid instruction was passed to TaskRouter when responding to a pending Reservation.

### Possible Causes

- An invalid instruction was passed to TaskRouter.

### Possible Solutions

- Ensure only valid instructions are being used. A list of valid instructions can be found at https://www.twilio.com/docs/taskrouter/api/reservations#action-update