[NSCFNumber _isNaturallyRTL]: unrecognized selector sent to instance 0x605ac10 - iphone

Question

my app got crashed an showed that keyword. There is no error and warning. can some body help me??
this is stack that showed :
Call stack at first throw: (
0 CoreFoundation 0x012ccbe9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x014215c2 objc_exception_throw + 47
2 CoreFoundation 0x012ce6fb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x0123e366 ___forwarding___ + 966
4 CoreFoundation 0x0123df22 _CF_forwarding_prep_0 + 50
5 UIKit 0x0042d35e -[UITextField setText:] + 53
6 MyApp 0x0006427a -[FilePropertiesViewController viewWillAppear:] + 442
7 UIKit 0x003c4d52 -[UIView(Hierarchy) _willMoveToWindow:withAncestorView:] + 207
8 UIKit 0x003cfa2b -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 378
9 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427
10 UIKit 0x003cfa5c -[UIView(Hierarchy) _makeSubtreePerformSelector:withObject:withObject:copySublayers:] + 427
11 UIKit 0x003c6b36 -[UIView(Internal) _addSubview:positioned:relativeTo:] + 370
12 UIKit 0x003c514f -[UIView(Hierarchy) addSubview:] + 57
13 UIKit 0x006ad8ae -[UIPopoverView presentFromRect:inView:contentSize:backgroundStyle:animated:] + 1920
14 UIKit 0x006a0a4c -[UIPopoverView presentFromRect:inView:animated:] + 236
15 UIKit 0x006d9b20 -[UIPopoverController presentPopoverFromRect:inView:permittedArrowDirections:animated:] + 1046
16 MyApp 0x0001f90f -[codeViewController arrangeTabWithTypeGesture:andNumtag:] + 4683
17 MyApp 0x0001e68f -[codeViewController setTap2:] + 99
18 UIKit 0x0061e9c7 -[UIGestureRecognizer _updateGestureWithEvent:] + 727
19 UIKit 0x0061a9d6 -[UIGestureRecognizer _delayedUpdateGesture] + 47
20 UIKit 0x00620fa5 _UIGestureRecognizerUpdateObserver + 584
21 UIKit 0x0062118a _UIGestureRecognizerUpdateGesturesFromSendEvent + 51
22 UIKit 0x003bc6b4 -[UIWindow _sendGesturesForEvent:] + 1292
23 UIKit 0x003b7f87 -[UIWindow sendEvent:] + 105
24 UIKit 0x0039b37a -[UIApplication sendEvent:] + 447
25 UIKit 0x003a0732 _UIApplicationHandleEvent + 7576
26 GraphicsServices 0x0191fa36 PurpleEventCallback + 1550
27 CoreFoundation 0x012ae064 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
28 CoreFoundation 0x0120e6f7 __CFRunLoopDoSource1 + 215
29 CoreFoundation 0x0120b983 __CFRunLoopRun + 979
30 CoreFoundation 0x0120b240 CFRunLoopRunSpecific + 208
31 CoreFoundation 0x0120b161 CFRunLoopRunInMode + 97
32 GraphicsServices 0x0191e268 GSEventRunModal + 217
33 GraphicsServices 0x0191e32d GSEventRun + 115
34 UIKit 0x003a442e UIApplicationMain + 1160
35 MyApp 0x00002680 main + 102
36 MyApp 0x00002611 start + 53
37 ??? 0x00000001 0x0 + 1
)
update
this is the code :
-(void)viewWillAppear:(BOOL)animated{
DocSegmentedModel *docSegmentedModel = [docProperties objectAtIndex:index];
NSString *segmenid = docSegmentedModel.docSegmentId;
NSFileManager *filemgr = [NSFileManager defaultManager];
NSDictionary *attribs;
NSString *sizes;
NSString *localFilePath = docSegmentedModel.docSegmentLocalPath;
NSLog(#"segmen id : %#", segmenid);
//get file name
fileName.text = docSegmentedModel.docSegmentFileName;
//get file size
attribs = [filemgr attributesOfItemAtPath:localFilePath error:NULL];
sizes = [attribs objectForKey:#"NSFileSize"];
NSLog(#"local path : %#", localFilePath);
NSLog(#"filesize : %#", sizes);
fileSize.text = sizes;
[filemgr release];
[attribs release];
}
the code is crash when I set the fileSize.text = sizes;
this is the dealloc method :
- (void)dealloc {
[fileSize release];
[super dealloc];
}

Answer 1

_isNaturallyRTL is an undocumented method of NSString. I assume that fileSize is a UILabel and so you need to assign an NSString to its text property. However, the dictionary you got returned by the fileManager holds an NSNumber object for the NSFileSize key containing an unsigned long long value. So you assign an NSNumber object to an NSString property, which cannot work.
Try fileSize.text = [sizes stringVlue];.