# 40140: Failed to issue Dequeue instruction due to missing 'call\_sid' property

Log Type: APPLICATION

Log Level: ERROR

## Description

### Possible causes

* The Task was not created via the `<Enqueue>` verb
* The `call_sid` property is missing in the Task's attributes

### Possible solutions

* Only issue Dequeue instruction on Tasks created via the `<Enqueue>` verb
* Ensure that `call_sid` property is present in the Task's attributes