error

Exception while invoking method 'play' [object Object]
    at Object.Future.wait (/Users/josh/.meteorite/meteors/meteor/meteor/5d736d4bf0448c7db1f9b47124dfafc34a9631bb/dev_bundle/lib/node_modules/fibers/future.js:322:15)
    at monitorPlay (app/server/play.coffee.js:36:18)
    at Meteor.methods.play (app/server/play.coffee.js:22:12)
    at maybeAuditArgumentChecks (app/packages/livedata/livedata_server.js:1367:12)
    at _.extend.protocol_handlers.method.exception (app/packages/livedata/livedata_server.js:596:20)
    at _.extend.withValue (app/packages/meteor/dynamics_nodejs.js:31:17)
    at app/packages/livedata/livedata_server.js:595:44
    at _.extend.withValue (app/packages/meteor/dynamics_nodejs.js:31:17)
    at _.extend.protocol_handlers.method (app/packages/livedata/livedata_server.js:594:48)
    at _.extend.processMessage.processNext (app/packages/livedata/livedata_server.js:488:43)

play.js

var monitorPlay;


Meteor.methods({
  play: function(mediaFileId, deviceId) {
    var airplay, ap_device, content, device, mediaFile;
    airplay = Airplay.createBrowser();
    device = Devices.findOne({
      _id: deviceId
    });
    mediaFile = MediaFiles.findOne({
      _id: mediaFileId
    });
    ap_device = _.find(DeviceList, function(d) {
      return d['info_']['host'] === device['host'];
    });
    content = "http://10.0.1.201:81/" + (encodeURI(mediaFile['path']));
    console.log("Content URL: " + content);
    ap_device.play(content, 0);
    return monitorPlay(ap_device, mediaFile);
  }
});

monitorPlay = function(device, mediaFile) {
  var cb, future, loading, percentage, res, running, _results;
  loading = true;
  running = false;
  console.log("Starting play monitor");
  future = new Future();
  cb = future.resolver();
  while (loading) {
    device.status(cb);
    res = future.wait();
    console.log(res.inspect);
    if (res.duration > 0) {
      console.log("Loaded");
      loading = false;
      running = true;
    }
  }
  _results = [];
  while (running) {
    device.status(cb);
    res = future.wait();
    console.log("Running");
    if (res.duration > 0) {
      console.log("Updating play percentage");
      percentage = new Number((res.position / res.duration) * 100);
      _results.push(mediaFile.update({
        viewed_percentage: percentage.toPrecision(3)
      }));
    } else {
      running = false;
      _results.push(console.log("Finished playing " + mediaFile.name));
    }
  }
  return _results;
};

Meteor.startup(function() {
  Future = Npm.require('fibers/future');
});