If you have the newer Raspberry Pi 2 and want to run WebIOPi on it you’ll need to make a change.
From the command line interface go to your home directory:
cd WebIOPi-0.7.1 or WebIOPi-0.7.0 depending on which version you are using. d
Change “#define BCM2708_PERI_BASE 0x20000000” to “#define BCM2708_PERI_BASE 0x3f000000”
Ctrl – X , save and exit. Reboot.