GATT service on RuuviTag

Hello,
I'm trying to set up a GATT service on the Ruuvitag. I used the Espruino's documentation to find that code :

var Ruuvitag = require("Ruuvitag");

Ruuvitag.setEnvOn(true);

NRF.setServices({
  0x1800: {
    0x2A6E: {
      notify: true,
      value : Ruuvitag.getEnvData().temp,
    }
  }
}, { advertise: [0x1801] });

setInterval(function () {
  NRF.updateServices({
    0x1800: {
      0x2A6E: {
        value: Ruuvitag.getEnvData().temp,
        notify: true
      }
    }
  });
}, 1000);

But when I run it on the Ruuvitag, I got the following error from the javascript console :

Uncaught Error: Unable to find service with UUID 0x2a6e
 at line 8 col 4
  });
   ^
in function called from system

I don't know what i'm doing wrong. Thanks for helping me.