EXC_BAD_INSTRUCTION upon pressing a button - ios

Question

I'm newbie in Swift and I'm currenlty trying to learn it but I faced a mystery issue. As you can see in the image below, there are some controls that are linked properly to this View Controller and upon pressing a button in the UI we execute this code below but I always got an EXC_BAD_INSTRUCTION. I don't understand why!!
Here is some info from the stack trace.
(lldb) thread info
thread #1: tid = 0x9319, 0x0006c5d5 App`App.AViewController.sendCommentViaEmail (self=<unavailable>)() -> () + 9349 at AViewController.swift:49, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
(lldb) frame select 1
frame #1: 0x037067cd libobjc.A.dylib`-[NSObject performSelector:withObject:withObject:] + 84
libobjc.A.dylib`-[NSObject performSelector:withObject:withObject:] + 84:
-> 0x37067cd: addl $0x1c, %esp
0x37067d0: popl %esi
0x37067d1: popl %edi
0x37067d2: popl %ebx
EDITED:
Stacktrace below
* thread #1: tid = 0x1e19, 0x0005a5d5 A`A.AViewController.sendCommentViaEmail (self=<unavailable>)() -> () + 9349 at AViewController.swift:49, queue = 'com.apple.main-thread', stop reason = EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
* frame #0: 0x0005a5d5 A`A.AViewController.sendCommentViaEmail (self=<unavailable>)() -> () + 9349 at AViewController.swift:49
frame #1: 0x036f47cd libobjc.A.dylib`-[NSObject performSelector:withObject:withObject:] + 84
frame #2: 0x01ea323d UIKit`-[UIApplication sendAction:to:from:forEvent:] + 99
frame #3: 0x02213840 UIKit`-[UIBarButtonItem(UIInternal) _sendAction:withEvent:] + 139
frame #4: 0x036f47cd libobjc.A.dylib`-[NSObject performSelector:withObject:withObject:] + 84
frame #5: 0x01ea323d UIKit`-[UIApplication sendAction:to:from:forEvent:] + 99
frame #6: 0x01ea31cf UIKit`-[UIApplication sendAction:toTarget:fromSender:forEvent:] + 64
frame #7: 0x01fd6e86 UIKit`-[UIControl sendAction:to:forEvent:] + 69
frame #8: 0x01fd72a3 UIKit`-[UIControl _sendActionsForEvents:withEvent:] + 598
frame #9: 0x01fd650d UIKit`-[UIControl touchesEnded:withEvent:] + 660
frame #10: 0x01ef360a UIKit`-[UIWindow _sendTouchesForEvent:] + 874
frame #11: 0x01ef40e5 UIKit`-[UIWindow sendEvent:] + 791
frame #12: 0x01eb9549 UIKit`-[UIApplication sendEvent:] + 242
frame #13: 0x01ec937e UIKit`_UIApplicationHandleEventFromQueueEvent + 20690
frame #14: 0x01e9db19 UIKit`_UIApplicationHandleEventQueue + 2206
frame #15: 0x039791df CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15
frame #16: 0x0396eced CoreFoundation`__CFRunLoopDoSources0 + 253
frame #17: 0x0396e248 CoreFoundation`__CFRunLoopRun + 952
frame #18: 0x0396dbcb CoreFoundation`CFRunLoopRunSpecific + 443
frame #19: 0x0396d9fb CoreFoundation`CFRunLoopRunInMode + 123
frame #20: 0x085dc24f GraphicsServices`GSEventRunModal + 192
frame #21: 0x085dc08c GraphicsServices`GSEventRun + 104
frame #22: 0x01ea18b6 UIKit`UIApplicationMain + 1526
frame #23: 0x000919cc A`main(argc=1, argv=0xbffaa62c) + 76 at main.m:12
frame #24: 0x04490ac9 libdyld.dylib`start + 1
Here are the properties I'm using:
I got the same result whether they are linked to the UI or not.

Answer 1

Where does emailToMyselfSwitch come from? If it's an IBOutlet it seems that you forgot to connect it from IB to your code. If that's not the case please show more context.

Answer 2

This error EXC_BAD_INSTRUCTION generally means that you are calling a property or method (selector?) on a null object or an object that can't respond to the selector ie self.null.on or a property that cannot be accessed because it was released.
I've had trouble in the past with these weak vars falling away. Try deleting the weak in your property.

Answer 3

your code is correct. The problem is not in the connection with outlet. I´ve tested and prints: "Value: nil"
The problem is in other part of code.
The message "self=" is not normal.
You can show us more information.