Error while creating pin files

[alexarroyoduque]

Hi, I'm using a raspberry pi.

I have been experimenting with the CylonJS library following the documentation example. However when I run the script I get the following error.

Can anybody help me?

2017-08-07T18:50:16.659Z : [Robot 1] - Starting connections.
2017-08-07T18:50:16.677Z : [Robot 1] - Starting connection 'raspi'.
2017-08-07T18:50:16.705Z : [Robot 1] - Starting devices.
2017-08-07T18:50:16.713Z : [Robot 1] - Starting device 'led' on pin 18.
2017-08-07T18:50:16.720Z : [Robot 1] - Working.
events.js:187
      throw err;
      ^

Error: Unhandled "error" event. (Error while creating pin files)
    at DigitalPin.emit (events.js:185:19)
    at DigitalPin.<anonymous> (/home/pi/led-project/node_modules/cylon/lib/io/digital-pin.js:117:12)
    at fs.js:1279:7
    at FSReqWrap.oncomplete (fs.js:135:15)

var Cylon = require("cylon");
Cylon.robot({
  connections: {
    raspi: { adaptor: 'raspi' }
  },

  devices: {
    led: { driver: 'led', pin: 18 }
  },

  work: function(my) {
    every((1).second(), my.led.toggle);
  }
}).start();