long press gesture issue - iphone

Question

I have long press gesture in my app and it works good in ios 5.0 but in ios 4.3 i have exception. Here what i see in debug
[UILongPressGestureRecognizer initWithCoder:]: unrecognized selector sent to instance 0x5863360
2012-03-23 23:39:30.384 Woods2[289:ef03] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UILongPressGestureRecognizer initWithCoder:]: unrecognized selector sent to instance 0x5863360'
*** Call stack at first throw:
(
0 CoreFoundation 0x013415a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x01ce6313 objc_exception_throw + 44
2 CoreFoundation 0x013430bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x012b2966 ___forwarding___ + 966
4 CoreFoundation 0x012b2522 _CF_forwarding_prep_0 + 50
5 UIKit 0x005bb9fd UINibDecoderDecodeObjectForValue + 2592
6 UIKit 0x005bb2f5 UINibDecoderDecodeObjectForValue + 792
7 UIKit 0x005bc6ac -[UINibDecoder decodeObjectForKey:] + 398
8 UIKit 0x004d0c54 -[UINib instantiateWithOwner:options:] + 834
9 UIKit 0x004d2ab7 -[NSBundle(UINSBundleAdditions) loadNibNamed:owner:options:] + 168
10 UIKit 0x00388628 -[UIViewController _loadViewFromNibNamed:bundle:] + 70
11 UIKit 0x00386134 -[UIViewController loadView] + 120
12 UIKit 0x0038600e -[UIViewController view] + 56
13 Woods2 0x00004f37 -[FirstViewController viewDidLoad] + 1671
14 UIKit 0x00386089 -[UIViewController view] + 179
15 UIKit 0x00398f54 -[UITabBarController transitionFromViewController:toViewController:transition:shouldSetSelected:] + 120
16 UIKit 0x00397aaa -[UITabBarController transitionFromViewController:toViewController:] + 64
17 UIKit 0x003998a2 -[UITabBarController _setSelectedViewController:] + 263
18 UIKit 0x00399d5e -[UITabBarController viewWillLayoutSubviews] + 170
19 UIKit 0x004aa2e9 -[UILayoutContainerView layoutSubviews] + 226
20 QuartzCore 0x019faa5a -[CALayer layoutSublayers] + 181
21 QuartzCore 0x019fcddc CALayerLayoutIfNeeded + 220
22 QuartzCore 0x019a20b4 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 310
23 QuartzCore 0x019a3294 _ZN2CA11Transaction6commitEv + 292
24 UIKit 0x002d89c9 -[UIApplication _reportAppLaunchFinished] + 39
25 UIKit 0x002d8e83 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 690
26 UIKit 0x002e3617 -[UIApplication handleEvent:withNewEvent:] + 1533
27 UIKit 0x002dbabf -[UIApplication sendEvent:] + 71
28 UIKit 0x002e0f2e _UIApplicationHandleEvent + 7576
29 GraphicsServices 0x015eb992 PurpleEventCallback + 1550
30 CoreFoundation 0x01322944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
31 CoreFoundation 0x01282cf7 __CFRunLoopDoSource1 + 215
32 CoreFoundation 0x0127ff83 __CFRunLoopRun + 979
33 CoreFoundation 0x0127f840 CFRunLoopRunSpecific + 208
34 CoreFoundation 0x0127f761 CFRunLoopRunInMode + 97
35 UIKit 0x002d87d2 -[UIApplication _run] + 623
36 UIKit 0x002e4c93 UIApplicationMain + 1160
37 Woods2 0x00001c2a main + 170
38 Woods2 0x00001b75 start + 53
)
terminate called throwing an exceptionkill
Thank you very much for help
Here is the some code in viewdidload
UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:#selector(handleLongPress:)];
lpgr.minimumPressDuration = 0.2; //user needs to press for 2 seconds
[mapView addGestureRecognizer:lpgr];
[lpgr release];

Answer 1

That trace data is much better formatted now. Now I see it's happening on the loadFromNib, not even when the user performs a long press. And it makes sense especially if the nib was copied in from another project.
Please see if you can find a gesture recognizer in your nib. If it's there, check the connections inspector. It might have some invalid references, possibly to symbols in another project. (You'll probably see a little "!" near one or more of the connections).
If you find that, then problem solved. Delete it, and use the GR you've set up in code. (or re-configure the pointers in the nib and comment out the code in viewDidLoad:).