Arduino Networked Lamp Processing sketch error.

Hi. Total newb here. You have been warned. When I wrote the processing sketch part of this project, the program highlights the line URL url = new URL9feed); it tells me that it cannot find a class or type named URL. In my frustration I went to the page with the code and copy pasted it into a new sketch and I still get the same error. Can anyone tell me what is going on? Two things... This is not a

[kyokucho1989]

Arduinoをはじめよう　第六章のスケッチについての質問。僕も同じエラーが出ている。