iOS (Swift) - Casting root view controller of the app delegate's window works in simulator, but fails when app is loaded on phone -

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when run app following lines of code (inside appdelegate.swift file): 

func locationmanager(manager: cllocationmanager!,     didrangebeacons beacons: [anyobject],     inregion region: clbeaconregion!) {      let viewcontroller:viewcontroller = window!.rootviewcontroller as! viewcontroller     viewcontroller.beacons = beacons as! [clbeacon]     viewcontroller.tableview.reloaddata()   ...... }

it runs flawlessly when run app in simulator. otherwise, when run app on phone runtime error:

could not cast value of type 'uitableviewcontroller' (0x198be57d0) 'beacontest.viewcontroller' (0x1000e15d0).

viewcontroller subclass of uitableviewcontroller defined so:

http://wwww.pastebin.com/1bm80ipp

where window's root view controller being set?

if in storyboard, ensure class of root view controller viewcontroller , not uitableviewcontroller.


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