Showing a view controller modally in monotouch - iphone

Question

In my Monotouch based iOS project , i have 2 view controllers .On first ViewController i have created a button by xib.
Now on selection of this button i want to display the second view controller but it is not happening and it causes the application to crash.
So in my design.cs file this is the way the button is created
[Outlet]
MonoTouch.UIKit.UIButton firstButton { get; set; }
[Action ("clickMe:")]
partial void clickMe (MonoTouch.Foundation.NSObject sender);
This is in my button action method in .cs file, which is causing the crash.
partial void clickMe (MonoTouch.Foundation.NSObject sender)
{
SecondViewController secondViewControllerObject=new SecondViewController();
this.PresentViewController(secondViewControllerObject, true, null);
}
Error Description :-
Got a SIGABRT while executing native code.
Terminating runtime due to unhandled exception
Unhandled Exception:
0 TestingFirstProject 0x0008ebce mono_handle_exception_internal_first_pass + 2190
1 TestingFirstProject 0x00090612 mono_handle_exception_internal + 1602
2 TestingFirstProject 0x0009115f mono_handle_exception + 47
3 TestingFirstProject 0x000d42b2 mono_x86_throw_exception + 306
4 ??? 0x0b496f8f 0x0 + 189362063
5 TestingFirstProject 0x00215f38 monotouch_exception_handler + 136
6 CoreFoundation 0x013ca318 __handleUncaughtException + 728
7 libobjc.A.dylib 0x0401d0b9 _ZL15_objc_terminatev + 86
8 libc++abi.dylib 0x0435ea65 _ZL19safe_handler_callerPFvvE + 13
9 libc++abi.dylib 0x0435eacd __cxa_bad_typeid + 0
10 libc++abi.dylib 0x0435fbc2 _ZL23__gxx_exception_cleanup19_Unwind_Reason_CodeP17_Unwind_Exception + 0
11 libobjc.A.dylib 0x0401cf89 _ZL26_objc_exception_destructorPv + 0
12 CoreFoundation 0x013c9fb1 -[NSException raise] + 17
13 Foundation 0x01a08711 -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
14 Foundation 0x01989ec8 _NSSetUsingKeyValueSetter + 140
15 Foundation 0x019899b7 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
16 Foundation 0x019b4428 -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
17 UIKit 0x029410cc -[UIRuntimeOutletConnection connect] + 106
18 libobjc.A.dylib 0x04030663 -[NSObject performSelector:] + 62
19 CoreFoundation 0x0133c45a -[NSArray makeObjectsPerformSelector:] + 314
20 UIKit 0x0293fbcf -[UINib instantiateWithOwner:options:] + 1327
21 UIKit 0x02804e37 -[UIViewController _loadViewFromNibNamed:bundle:] + 280
22 UIKit 0x02805418 -[UIViewController loadView] + 302
23 UIKit 0x02805648 -[UIViewController loadViewIfRequired] + 73
24 UIKit 0x02805882 -[UIViewController view] + 33
25 UIKit 0x02811235 -[UIViewController shouldAutorotate] + 36
26 UIKit 0x02a103d2 -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:] + 1933
27 UIKit 0x0280e4f3 -[UIViewController presentViewController:withTransition:completion:] + 4521
28 UIKit 0x0280e777 -[UIViewController presentViewController:animated:completion:] + 112
at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging.void_objc_msgSendSuper_IntPtr_bool_IntPtr (intptr,intptr,intptr,bool,intptr) <IL 0x00016, 0x00044>
at MonoTouch.UIKit.UIViewController.PresentViewController (MonoTouch.UIKit.UIViewController,bool,MonoTouch.Foundation.NSAction) [0x0006f] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIViewController.g.cs:659
at TestingFirstProject.TestingFirstProjectViewController.clickMe (MonoTouch.Foundation.NSObject) [0x00006] in /Users/rock/Desktop/Sample Project/TestingFirstProject/TestingFirstProject/TestingFirstProjectViewController.cs:41
at (wrapper runtime-invoke) <Module>.runtime_invoke_void__this___object (object,intptr,intptr,intptr) <IL 0x0004b, 0x0007d>
33 TestingFirstProject 0x00009922 mono_jit_runtime_invoke + 722
34 TestingFirstProject 0x0016c4ae mono_runtime_invoke + 126
35 TestingFirstProject 0x0020f086 monotouch_trampoline + 3686
36 libobjc.A.dylib 0x04030705 -[NSObject performSelector:withObject:withObject:] + 77
37 UIKit 0x02727920 -[UIApplication sendAction:to:from:forEvent:] + 96
38 UIKit 0x027278b8 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
39 UIKit 0x027e8671 -[UIControl sendAction:to:forEvent:] + 66
40 UIKit 0x027e8bcf -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 578
41 UIKit 0x027e7d38 -[UIControl touchesEnded:withEvent:] + 546
42 UIKit 0x0275733f -[UIWindow _sendTouchesForEvent:] + 846
43 UIKit 0x02757552 -[UIWindow sendEvent:] + 273
44 UIKit 0x027353aa -[UIApplication sendEvent:] + 436
45 UIKit 0x02726cf8 _UIApplicationHandleEvent + 9874
46 GraphicsServices 0x04d0fdf9 _PurpleEventCallback + 339
47 GraphicsServices 0x04d0fad0 PurpleEventCallback + 46
48 CoreFoundation 0x012b6bf5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
49 CoreFoundation 0x012b6962 __CFRunLoopDoSource1 + 146
50 CoreFoundation 0x012e7bb6 __CFRunLoopRun + 2118
51 CoreFoundation 0x012e6f44 CFRunLoopRunSpecific + 276
52 CoreFoundation 0x012e6e1b CFRunLoopRunInMode + 123
53 GraphicsServices 0x04d0e7e3 GSEventRunModal + 88
54 GraphicsServices 0x04d0e668 GSEventRun + 104
55 UIKit 0x0272465c UIApplicationMain + 1211
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication.UIApplicationMain (int,string[],intptr,intptr) <IL 0x00056, 0x000a4>
at MonoTouch.UIKit.UIApplication.Main (string[],string,string) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
at TestingFirstProject.Application.Main (string[]) [0x00000] in /Users/rock/Desktop/Sample Project/TestingFirstProject/TestingFirstProject/Main.cs:17
at (wrapper runtime-invoke) <Module>.runtime_invoke_void_object (object,intptr,intptr,intptr) <IL 0x00049, 0x00077>
60 TestingFirstProject 0x00009922 mono_jit_runtime_invoke + 722
61 TestingFirstProject 0x0016c4ae mono_runtime_invoke + 126
62 TestingFirstProject 0x001706a4 mono_runtime_exec_main + 420
63 TestingFirstProject 0x00175a95 mono_runtime_run_main + 725
64 TestingFirstProject 0x00066e05 mono_jit_exec + 149
65 TestingFirstProject 0x0020433d main + 2013
66 TestingFirstProject 0x00002955 start + 53
[ERROR] FATAL UNHANDLED EXCEPTION: MonoTouch.Foundation.MonoTouchException: Objective-C exception thrown. Name: NSUnknownKeyException Reason: [<SecondViewController 0x12a36ca0> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key butnSubmit.
at (wrapper managed-to-native) MonoTouch.ObjCRuntime.Messaging:void_objc_msgSendSuper_IntPtr_bool_IntPtr (intptr,intptr,intptr,bool,intptr)
at MonoTouch.UIKit.UIViewController.PresentViewController (MonoTouch.UIKit.UIViewController viewControllerToPresent, Boolean animated, MonoTouch.Foundation.NSAction completionHandler) [0x0006f] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIViewController.g.cs:659
at TestingFirstProject.TestingFirstProjectViewController.clickMe (MonoTouch.Foundation.NSObject sender) [0x00006] in /Users/rock/Desktop/Sample Project/TestingFirstProject/TestingFirstProject/TestingFirstProjectViewController.cs:41
at (wrapper managed-to-native) MonoTouch.UIKit.UIApplication:UIApplicationMain (int,string[],intptr,intptr)
at MonoTouch.UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0004c] in /Developer/MonoTouch/Source/monotouch/src/UIKit/UIApplication.cs:38
at TestingFirstProject.Application.Main (System.String[] args) [0x00000] in /Users/rock/Desktop/Sample Project/TestingFirstProject/TestingFirstProject/Main.cs:17
Stacktrace:
Native stacktrace:
0 TestingFirstProject 0x0009148c mono_handle_native_sigsegv + 284
1 TestingFirstProject 0x000d769d sigabrt_signal_handler + 109
2 libsystem_c.dylib 0x9a4c386b _sigtramp + 43
3 ??? 0xffffffff 0x0 + 4294967295
4 libsystem_sim_c.dylib 0x041e057b abort + 140
5 TestingFirstProject 0x001ea3fd monoeg_g_logv + 157
6 TestingFirstProject 0x001ea42b monoeg_assertion_message + 43
7 TestingFirstProject 0x00215e5f monotouch_unhandled_exception_handler + 159
8 TestingFirstProject 0x0008cefc mono_invoke_unhandled_exception_hook + 140
9 TestingFirstProject 0x0009100a mono_handle_exception_internal + 4154
10 TestingFirstProject 0x0009115f mono_handle_exception + 47
11 TestingFirstProject 0x000d42b2 mono_x86_throw_exception + 306
12 ??? 0x0b496f8f 0x0 + 189362063
13 TestingFirstProject 0x00215f38 monotouch_exception_handler + 136
14 CoreFoundation 0x013ca318 __handleUncaughtException + 728
15 libobjc.A.dylib 0x0401d0b9 _ZL15_objc_terminatev + 86
16 libc++abi.dylib 0x0435ea65 _ZL19safe_handler_callerPFvvE + 13
17 libc++abi.dylib 0x0435eacd __cxa_bad_typeid + 0
18 libc++abi.dylib 0x0435fbc2 _ZL23__gxx_exception_cleanup19_Unwind_Reason_CodeP17_Unwind_Exception + 0
19 libobjc.A.dylib 0x0401cf89 _ZL26_objc_exception_destructorPv + 0
20 CoreFoundation 0x013c9fb1 -[NSException raise] + 17
21 Foundation 0x01a08711 -[NSObject(NSKeyValueCoding) setValue:forUndefinedKey:] + 282
22 Foundation 0x01989ec8 _NSSetUsingKeyValueSetter + 140
23 Foundation 0x019899b7 -[NSObject(NSKeyValueCoding) setValue:forKey:] + 267
24 Foundation 0x019b4428 -[NSObject(NSKeyValueCoding) setValue:forKeyPath:] + 412
25 UIKit 0x029410cc -[UIRuntimeOutletConnection connect] + 106
26 libobjc.A.dylib 0x04030663 -[NSObject performSelector:] + 62
27 CoreFoundation 0x0133c45a -[NSArray makeObjectsPerformSelector:] + 314
28 UIKit 0x0293fbcf -[UINib instantiateWithOwner:options:] + 1327
29 UIKit 0x02804e37 -[UIViewController _loadViewFromNibNamed:bundle:] + 280
30 UIKit 0x02805418 -[UIViewController loadView] + 302
31 UIKit 0x02805648 -[UIViewController loadViewIfRequired] + 73
32 UIKit 0x02805882 -[UIViewController view] + 33
33 UIKit 0x02811235 -[UIViewController shouldAutorotate] + 36
34 UIKit 0x02a103d2 -[UIWindowController transition:fromViewController:toViewController:target:didEndSelector:] + 1933
35 UIKit 0x0280e4f3 -[UIViewController presentViewController:withTransition:completion:] + 4521
36 UIKit 0x0280e777 -[UIViewController presentViewController:animated:completion:] + 112
37 ??? 0x129333bc 0x0 + 311636924
38 ??? 0x12933118 0x0 + 311636248
39 ??? 0x12932ff5 0x0 + 311635957
40 ??? 0x12931ff5 0x0 + 311631861
41 TestingFirstProject 0x00009922 mono_jit_runtime_invoke + 722
42 TestingFirstProject 0x0016c4ae mono_runtime_invoke + 126
43 TestingFirstProject 0x0020f086 monotouch_trampoline + 3686
44 libobjc.A.dylib 0x04030705 -[NSObject performSelector:withObject:withObject:] + 77
45 UIKit 0x02727920 -[UIApplication sendAction:to:from:forEvent:] + 96
46 UIKit 0x027278b8 -[UIApplication sendAction:toTarget:fromSender:forEvent:] + 61
47 UIKit 0x027e8671 -[UIControl sendAction:to:forEvent:] + 66
48 UIKit 0x027e8bcf -[UIControl(Internal) _sendActionsForEvents:withEvent:] + 578
49 UIKit 0x027e7d38 -[UIControl touchesEnded:withEvent:] + 546
50 UIKit 0x0275733f -[UIWindow _sendTouchesForEvent:] + 846
51 UIKit 0x02757552 -[UIWindow sendEvent:] + 273
52 UIKit 0x027353aa -[UIApplication sendEvent:] + 436
53 UIKit 0x02726cf8 _UIApplicationHandleEvent + 9874
54 GraphicsServices 0x04d0fdf9 _PurpleEventCallback + 339
55 GraphicsServices 0x04d0fad0 PurpleEventCallback + 46
56 CoreFoundation 0x012b6bf5 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 53
57 CoreFoundation 0x012b6962 __CFRunLoopDoSource1 + 146
58 CoreFoundation 0x012e7bb6 __CFRunLoopRun + 2118
59 CoreFoundation 0x012e6f44 CFRunLoopRunSpecific + 276
60 CoreFoundation 0x012e6e1b CFRunLoopRunInMode + 123
61 GraphicsServices 0x04d0e7e3 GSEventRunModal + 88
62 GraphicsServices 0x04d0e668 GSEventRun + 104
63 UIKit 0x0272465c UIApplicationMain + 1211
64 ??? 0x0e9ccd74 0x0 + 245157236
65 ??? 0x0e9cb3e8 0x0 + 245150696
66 ??? 0x0e9cabe8 0x0 + 245148648
67 ??? 0x0e9cac77 0x0 + 245148791
68 TestingFirstProject 0x00009922 mono_jit_runtime_invoke + 722
69 TestingFirstProject 0x0016c4ae mono_runtime_invoke + 126
70 TestingFirstProject 0x001706a4 mono_runtime_exec_main + 420
71 TestingFirstProject 0x00175a95 mono_runtime_run_main + 725
72 TestingFirstProject 0x00066e05 mono_jit_exec + 149
73 TestingFirstProject 0x0020433d main + 2013
74 TestingFirstProject 0x00002955 start + 53
=================================================================
Got a SIGABRT while executing native code. This usually indicates
a fatal error in the mono runtime or one of the native libraries
used by your application.
=================================================================

Answer 1

The key bit of information in your exception is:
this class is not key value coding-compliant for the key butnSubmit
Which means that you have a property on your C# class which doesn't have a corresponding outlet in the .xib (interface builder) file.
Re-check/recreate your outlets, and see if that solves the problem.