It is not working

Thanks for this great example.

Unfortunately it does not work for me

I get 

```
Program Error: "Instruction #5 Failed - Unknown instruction error"
```

https://solscan.io/tx/5UWeSHKEvu6gFou4pPjnKhEenf4oMAZUkCfrEJUwDEveXaqVsi9A1iiVZxir1M5xZEaqKsxA96jXAba69fcyHZrA