# 40100: TaskRouter->Reject

Log Type: APPLICATION

Log Level: ERROR

## Description

Your Reject instruction does not include a valid `activity_sid` parameter.

### Possible causes

* You did not include an `activity_sid` parameter in your `reject` instruction.
* You did include an `activity_sid` but it was invalid or no longer exists.

### Possible solutions

* Confirm a valid `ActivitySid` value is is being passed by your code into the request payload JSON's `activity_sid` parameter: `{ "instruction": "reject", "activity_sid": "WA0123456789abcdef0123456789abcdef" }`