can someone please explain why this keeps crashing on iOS 4.2? - cocoa-touch

Question

The code worked in iOS 3.2 and in 4.2 it keeps crashing.
Here's the line that it crashes on.
NSArray* address = [NSArray arrayWithArray:[[[access.filteredResults objectAtIndex:[indexPath row]] addressArray] objectAtIndex:0]];
2010-11-04 12:20:03.060 ContactMapper[2211:207] -[__NSCFDictionary getObjects:range:]: unrecognized selector sent to instance 0x5648e30
2010-11-04 12:20:03.062 ContactMapper[2211:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFDictionary getObjects:range:]: unrecognized selector sent to instance 0x5648e30'
*** Call stack at first throw:
(
0 CoreFoundation 0x0117abe9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x012cf5c2 objc_exception_throw + 47
2 CoreFoundation 0x0117c6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x010ec366 ___forwarding___ + 966
4 CoreFoundation 0x010ebf22 _CF_forwarding_prep_0 + 50
5 CoreFoundation 0x01176605 -[NSArray initWithArray:range:copyItems:] + 245
6 CoreFoundation 0x010e1367 +[NSArray arrayWithArray:] + 119
7 ContactMapper 0x00003a8d -[RootViewController tableView:cellForRowAtIndexPath:] + 1333
8 UIKit 0x0033a7fa -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:withIndexPath:] + 634
9 UIKit 0x0033077f -[UITableView(UITableViewInternal) _createPreparedCellForGlobalRow:] + 75
10 UIKit 0x00345450 -[UITableView(_UITableViewPrivate) _updateVisibleCellsNow:] + 1561
11 UIKit 0x0033d538 -[UITableView layoutSubviews] + 242
12 QuartzCore 0x01fc2451 -[CALayer layoutSublayers] + 181
13 QuartzCore 0x01fc217c CALayerLayoutIfNeeded + 220
14 UIKit 0x005c7702 -[UISplitViewController willRotateToInterfaceOrientation:duration:] + 1134
15 UIKit 0x00373df2 -[UIViewController window:willRotateToInterfaceOrientation:duration:] + 962
16 UIKit 0x002edee5 -[UIWindow _setRotatableClient:toOrientation:updateStatusBar:duration:force:] + 1783
17 UIKit 0x002e8538 -[UIWindow _setRotatableViewOrientation:duration:force:] + 89
18 UIKit 0x002eb643 -[UIWindow _updateInterfaceOrientationFromDeviceOrientation:] + 164
19 Foundation 0x000306c1 _nsnote_callback + 145
20 CoreFoundation 0x01152f99 __CFXNotificationPost_old + 745
21 CoreFoundation 0x010d233a _CFXNotificationPostNotification + 186
22 Foundation 0x00026266 -[NSNotificationCenter postNotificationName:object:userInfo:] + 134
23 UIKit 0x00477d0a -[UIDevice setOrientation:animated:] + 228
24 UIKit 0x002c9637 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 656
25 UIKit 0x002d3db2 -[UIApplication handleEvent:withNewEvent:] + 1533
26 UIKit 0x002cc202 -[UIApplication sendEvent:] + 71
27 UIKit 0x002d1732 _UIApplicationHandleEvent + 7576
28 GraphicsServices 0x01ab0a36 PurpleEventCallback + 1550
29 CoreFoundation 0x0115c064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
30 CoreFoundation 0x010bc6f7 __CFRunLoopDoSource1 + 215
31 CoreFoundation 0x010b9983 __CFRunLoopRun + 979
32 CoreFoundation 0x010b9240 CFRunLoopRunSpecific + 208
33 CoreFoundation 0x010b9161 CFRunLoopRunInMode + 97
34 UIKit 0x002c8fa8 -[UIApplication _run] + 636
35 UIKit 0x002d542e UIApplicationMain + 1160
36 ContactMapper 0x00002638 main + 102
37 ContactMapper 0x000025c9 start + 53
)
terminate called after throwing an instance of 'NSException'

Answer 1

At first glance, this line is your problem:
[NSArray initWithArray:range:copyItems:]
at first glance, it might be that you need indexPath.row not [indexPath row].
Because iOS 4.2 is still under NDA, we cannot talk about 4.2-specific code.
We can however, talk about 4.1 and previous.
First, you're going to go to the 4.2 diffs page after you sign into the iOS Dev Center. This will tell you what's changed in that release. Since these pages only show release to release, look at the 3.2-4.0 diffs, 4.0-4.1 and 4.1-4.2 diffs. You are looking for a change in the API for UITableView or NSArray that obviously cannot be talked about here.
Second, you're going to download the WWDC '10 session on crash reports. It's a little tedious but the hour spent learning about how to read a crash report is WELL worth it.
Hope this helps!

Answer 2

The error you're getting tells you that the selector getObjects:range: is being sent to an __NSCFDictionary. So clearly the following:
[[[access.filteredResults objectAtIndex:[indexPath row]] addressArray] objectAtIndex:0]
... used to return an NSArray, but is now returning an NSDictionary.
I don't know what access is so I have no idea what else to say other than you can change the line you cited as the source of the error to:
NSDictionary* address = [NSDictionary dictionaryWithDictionary:[[[access.filteredResults objectAtIndex:[indexPath row]] addressArray] objectAtIndex:0]];
Once you've done that, whatever code follows that uses address clearly needs to also change to deal with the fact that you're no longer accessing an array.

Answer 3

You need the new iOS CookBook code