---
page_type: error
code: 40157
message: >-
  40157: Dequeue Instruction does not have a valid 'status_callback_url'
  parameter
level: ERROR
product: TaskRouter
---

## Description

Invalid 'status\_callback\_url' parameter - Dequeue Instruction

### Possible Causes

You have provided either an empty string or a value with incorrect datatype for the "status\_callback\_url" parameter.

### Possible Solutions

"status\_callback\_url" should be a well formed HTTP or HTTPS URL string.