gulpfile.js
function(err) {
    notify.onError({
        title:    "Error in " + err.plugin,
        message: err.message
    })(err);
    this.emit('end');
}
function(err) {
    notify.onError({
        title:    "Error in " + err.plugin,
        message: err.message
    })(err);
    this.emit('end');
}
Error Message