More errors message in the worker

[kalwalt]

In a Worker t's possible to send error message like this:

worker.onerror = function (err) {
    console.log('ERROR: ', err)
};

[albjeremias]

in the upper component should be able to catch the errors...

so it would be like:

ARnft.onerror = function(err) {
   console.log('There was an error: ', err);
}