NSUnknownKeyException - Xcode - swift

Question

My program shows this problem. Can anybody tell me what's wrong?
"2016-08-26 17:21:00.548 SegundaTentativa[2347:203583] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<SegundaTentativa.ViewController 0x7f9749d188d0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imQuadro.'
*** First throw call stack:
(
0 CoreFoundation 0x000000010786dd85 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000109611deb objc_exception_throw + 48
2 CoreFoundation 0x000000010786d9c9 -[NSException raise] + 9
3 Foundation 0x0000000107c3f19b -[NSObject(NSKeyValueCoding) setValue:forKey:] + 288
4 UIKit 0x0000000108228d0c -[UIViewController setValue:forKey:] + 88
5 UIKit 0x000000010845f7fb -[UIRuntimeOutletConnection connect] + 109
6 CoreFoundation 0x00000001077a7890 -[NSArray makeObjectsPerformSelector:] + 224
7 UIKit 0x000000010845e1de -[UINib instantiateWithOwner:options:] + 1864
8 UIKit 0x000000010822f8d6 -[UIViewController _loadViewFromNibNamed:bundle:] + 381
9 UIKit 0x0000000108230202 -[UIViewController loadView] + 178
10 UIKit 0x0000000108230560 -[UIViewController loadViewIfRequired] + 138
11 UIKit 0x0000000108230cd3 -[UIViewController view] + 27
12 UIKit 0x0000000108106fb4 -[UIWindow addRootViewControllerViewIfPossible] + 61
13 UIKit 0x000000010810769d -[UIWindow _setHidden:forced:] + 282
14 UIKit 0x0000000108119180 -[UIWindow makeKeyAndVisible] + 42
15 UIKit 0x000000010808ded9 -[UIApplication _callInitializationDelegatesForMainScene:transitionContext:] + 4131
16 UIKit 0x0000000108094568 -[UIApplication _runWithMainScene:transitionContext:completion:] + 1769
17 UIKit 0x0000000108091714 -[UIApplication workspaceDidEndTransaction:] + 188
18 FrontBoardServices 0x000000010b4a28c8 __FBSSERIALQUEUE_IS_CALLING_OUT_TO_A_BLOCK__ + 24
19 FrontBoardServices 0x000000010b4a2741 -[FBSSerialQueue _performNext] + 178
20 FrontBoardServices 0x000000010b4a2aca -[FBSSerialQueue _performNextFromRunLoopSource] + 45
21 CoreFoundation 0x0000000107793301 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
22 CoreFoundation 0x000000010778922c __CFRunLoopDoSources0 + 556
23 CoreFoundation 0x00000001077886e3 __CFRunLoopRun + 867
24 CoreFoundation 0x00000001077880f8 CFRunLoopRunSpecific + 488
25 UIKit 0x0000000108090f21 -[UIApplication _run] + 402
26 UIKit 0x0000000108095f09 UIApplicationMain + 171
27 SegundaTentativa 0x0000000107688432 main + 114
28 libdyld.dylib 0x000000010a0d592d start + 1
29 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb) "
ViewController:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var lbTexto: UILabel!
#IBOutlet weak var imgQuadro: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
lbTexto.text = "Que jogador de vôlei e?"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func ChangeText(sender: AnyObject) {
lbTexto.text = "Ricardinho"
}
#IBAction func HiddenQuadro(sender: AnyObject) {
imgQuadro.hidden = true
}
/*#IBAction func TesteSimbora(sender: UIButton) {
lbText.text = "Ricardinho"
}
#IBAction func EscondeQuadro(sender: UIButton) {
imQuadro.hidden = true
}*/
}

Answer 1

Pay attention to error message:
Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<SegundaTentativa.ViewController 0x7f9749d188d0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key imQuadro.'
Something tries to set non-existing imQuadro property of your view controller, and from stack trace mentioning outlets it probably happens when controller is loaded from storyboard/xib.
Most likely you have wrong outlet connection set in interface builder, that might happen if you initially created outlet with name imQuadro and then manually fixed it to imgQuadro only in your code.