I have use an arduino to communicate with TouchOSC.
But unless you give some idea of what you did how can anyone help you?
The Processing code was cut and pasted from a blog
OK so what blog?
How have you set up the ports on the app and on the device.
What are you using at the arduino end?
It is like saying I have a car and I filled it up with petrol ( gas ) and it doesn't work, please help.
Not enough information in both cases.