Code:

var workerFunction = function (param, done) {
    // divide by undeclared variable `y`:
    var x = param / y;
};

var pool = new ThreadPool();

pool.run(workerFunction, 10)
.done(function (result) {
    $('#error').text("No error.");
})
.error(function (errorEvent) {
    $('#error').append(
        $('').text("Worker encountered a problem:"),
        $('').text(errorEvent.message)
    )
});