Pirate Radio - Airplay speaker not working


I’ve followed the instructions for turning the Pirate Radio into an Airplay speaker here:

I’ve tried a couple of times, and each time I’ve had no luck. The speaker shows from iTunes on my iPhone 5, however when I select it, I hear a loud pop and it fails to connect.

I’ve already created the internet radio - which works fine, so I’m assuming my setup is all in order.

I’m fairly amateur too, just to add.

Help please! And thanks.