---
page_type: error
code: 40143
message: "40143: TaskRouter->Conference"
level: ERROR
product: TaskRouter
---

## Error - 40143

### Invalid Activity Sid - Conference Instruction

#### Possible Causes

- You provided a 'post\_work\_activity\_sid' that was invalid or no longer exists.

#### Possible Solutions

- Confirm a valid ActivitySid is being passed in the 'post\_work\_activity\_sid' parameter and it exists in your workspace.

#### Example

```
{
	"instruction": "conference",
	"room_name": "abc",
	"to": "client:alice",
	"from": "18001234567",
	"post_work_activity_sid": "WA0123456789abcdef0123456789abcdef"
}
```