unexpectedly found nil while unwrapping an Optional value when updating a label in cell

my codes are as below, but i'm getting an error the same as the title for the line commented out. i tried optional binding but still isn't working. i'm already updating the dates array in viewDidLoad so not sure why its found nil, any idea? Thanks!

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    let cell = myTableView.dequeueReusableCellWithIdentifier("logCell", forIndexPath: indexPath) as! logViewCell

   let dateFormatter = NSDateFormatter()
    dateFormatter.dateFormat = "dd-MMM-yy"
    // cell.date.text = dateFormatter.stringFromDate(dates[indexPath.row])       
}