---
page_type: error
code: 40151
message: "40151: TaskRouter->Invalid instruction"
level: ERROR
product: TaskRouter
---

## Error - 40151

### Call API Error - Invalid instruction issued on a task being transferred

#### Possible Causes

- Instruction is not acceptable for transferred tasks
- Internal Twilio API error.

#### Possible Solutions

- Make certain that instruction is accept, reject, conference, or supervise

#### Example

```
{
	"instruction": "conference"
}
```