pi@sebbapi ~/johnnyFW $ sudo node button
1455573612512 Device(s) RaspberryPi-IO
1455573612744 Connected RaspberryPi-IO
1455573612828 Repl Initialized
>> fs.js:658
    return binding.writeBuffer(fd, buffer, offset, length, position);
                   ^

Error: EIO: i/o error, write
    at Error (native)
    at Object.fs.writeSync (fs.js:658:20)
    at Bus.i2cWriteSync (/home/pi/johnnyFW/node_modules/raspi-io/node_modules/raspi-i2c/node_modules/i2c-bus/i2c-bus.js:340:13)
    at I2C.writeSync (/home/pi/johnnyFW/node_modules/raspi-io/node_modules/raspi-i2c/lib/index.js:341:34)
    at Raspi.i2cWrite (/home/pi/johnnyFW/node_modules/raspi-io/lib/index.js:482:19)
    at Expander.Controllers.MCP23017.pinMode.value (/home/pi/johnnyFW/node_modules/johnny-five/lib/expander.js:113:17)
    at Expander.Controllers.MCP23017.initialize.value (/home/pi/johnnyFW/node_modules/johnny-five/lib/expander.js:73:16)
    at new Expander (/home/pi/johnnyFW/node_modules/johnny-five/lib/expander.js:1462:10)
    at Board.<anonymous> (/home/pi/johnnyFW/button.js:9:5)
    at emitNone (events.js:67:13)
pi@sebbapi ~/johnnyFW $ sudo node button
1455573640059 Device(s) RaspberryPi-IO
1455573640345 Connected RaspberryPi-IO
1455573640429 Repl Initialized
>> 1
events.js:141
      throw er; // Unhandled 'error' event
      ^

Error: EIO, Input/output error
    at Error (native)
pi@sebbapi ~/johnnyFW $ sudo node button
1455574328916 Device(s) RaspberryPi-IO
1455574329201 Connected RaspberryPi-IO
1455574329285 Repl Initialized
>> 1