# 55555: Invalid Instruction passed to TaskRouter

Log Type: APPLICATION

Log Level: ERROR

## 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