ios - tableview finds nil while using a xib cell -

i'm trying use xib file cell in table view. says "unexpectedly found nil while unwrapping optional value" on registernib. think it's referencing outlet don't know why occurs. view follow:

as shows, table view inside play video view controller.

my viewdidload is:

override func viewdidload() {     super.viewdidload()     // additional setup after loading view, typically nib.      self.tableview.registernib(uinib(nibname: "newesttableviewcell", bundle: nil), forcellreuseidentifier: "newesttableviewcell") } 

and table view methods:

// mark: - table view data source func numberofsectionsintableview(tableview: uitableview) -> int {     return 1 }  func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int {     return video.count }  func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell {     let cell : newesttableviewcell = tableview.dequeuereusablecellwithidentifier("newesttableviewcell") as! newesttableviewcell      let vd = video[indexpath.row]      cell.title.text = vd.title     cell.title.textalignment = .right     cell.duration.layer.bordercolor = uicolor.whitecolor().cgcolor     cell.duration.layer.borderwidth = 1.0     cell.duration.layer.cornerradius = 3.0     cell.duration.clipstobounds = true     cell.duration.text = vd.length     imagedl(vd.imageurl){ image in         cell.videoimage.image = image     }     cell.time.text = vd.published     cell.time.textalignment = .right     cell.viewed.text = vd.view     cell.viewed.textalignment = .right       return cell } 

i used nib in other tableviewcontrollers when using in uiviewcontroller contains tableview, it'n not working. reason causes this?

thanks

the thing in line forcefully unwrapped tableview. check referencing outlet.