App will crash when run on iOS 4.3 in simulator - iphone

Question

My app running perfectlly in iOS 5.1 and iOS 6.1. But wheen I try to run it on iOS 4.3 than it was crahing on this code:
[self.tabBarItem setFinishedSelectedImage:[UIImage imageNamed:#"home-active.png"] withFinishedUnselectedImage:[UIImage imageNamed:#"home-normal"]];
I'm using this code to seting image on TabBar.
This is my log information.
2013-03-08 15:16:27.688 GrandNatural[3372:12c03] -[UITabBarItem setFinishedSelectedImage:withFinishedUnselectedImage:]: unrecognized selector sent to instance 0x628c090
2013-03-08 15:16:27.690 GrandNatural[3372:12c03] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITabBarItem setFinishedSelectedImage:withFinishedUnselectedImage:]: unrecognized selector sent to instance 0x628c090'
*** Call stack at first throw:
(
0 CoreFoundation 0x019785a9 __exceptionPreprocess + 185
1 libobjc.A.dylib 0x016e7313 objc_exception_throw + 44
2 CoreFoundation 0x0197a0bb -[NSObject(NSObject) doesNotRecognizeSelector:] + 187
3 CoreFoundation 0x018e9966 ___forwarding___ + 966
4 CoreFoundation 0x018e9522 _CF_forwarding_prep_0 + 50
5 GrandNatural 0x0000f8fe -[HomeViewController initWithNibName:bundle:] + 535
6 GrandNatural 0x00002985 -[GrandNaturalAppDelegate application:didFinishLaunchingWithOptions:] + 262
7 UIKit 0x00ce5c89 -[UIApplication _callInitializationDelegatesForURL:payload:suspended:] + 1163
8 UIKit 0x00ce7d88 -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 439
9 UIKit 0x00cf2617 -[UIApplication handleEvent:withNewEvent:] + 1533
10 UIKit 0x00ceaabf -[UIApplication sendEvent:] + 71
11 UIKit 0x00ceff2e _UIApplicationHandleEvent + 7576
12 GraphicsServices 0x021dd992 PurpleEventCallback + 1550
13 CoreFoundation 0x01959944 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 52
14 CoreFoundation 0x018b9cf7 __CFRunLoopDoSource1 + 215
15 CoreFoundation 0x018b6f83 __CFRunLoopRun + 979
16 CoreFoundation 0x018b6840 CFRunLoopRunSpecific + 208
17 CoreFoundation 0x018b6761 CFRunLoopRunInMode + 97
18 UIKit 0x00ce77d2 -[UIApplication _run] + 623
19 UIKit 0x00cf3c93 UIApplicationMain + 1160
20 GrandNatural 0x00002856 main + 132
21 GrandNatural 0x00002795 start + 53
)
terminate called throwing an exception(lldb)

Answer 1

You can set image on tabbar using this code :
if ([[[UIDevice currentDevice] systemVersion] floatValue]<5.0)
{
self.tabBarItem = [[UITabBarItem alloc] initWithTitle:#"your name" image:[UIImage imageNamed:#"home-normal"] tag:0];
}
else
{
self.tabBarItem = [[UITabBarItem alloc] init];
self.tabBarItem.title = #"your name";
[self.tabBarItem setFinishedSelectedImage:[UIImage imageNamed:#"home-active"] withFinishedUnselectedImage:[UIImage imageNamed:#"home-normal"]];
}

Answer 2

Ok, go to the documentation page for UITabBarItem, find that method, and tell me what it says under Availability
I'll give you a hint: 4.3 is not valid.