Camera is not working in the iPhone 4

Hello All,
I have implemented the camera work in my application and this is working perfectly in the iPhone 3 and 3GS but not working in iPhone 4. Its crashed and says "Thread 0 crashed with ARM Thread State". I am sending the code snippet below.
-(IBAction)ClickImage:(id)sender
UIButton *btn=(UIButton *)sender;
ImageTag=btn.tag;
UIImagePickerController *picker=[[UIImagePickerController alloc]init];
if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])
picker.sourceType=UIImagePickerControllerSourceTypeCamera;
else
UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"Rubyster Insurance" message:@"Camera is not available" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
[alert show];
[alert release];
picker.delegate=self;
[self presentModalViewController:picker animated:YES];
Please let me know what can be the issue and how to resolve it.
Thanks in advance.

Your code works as is on my iPhone 4 at iOS 4.3.3.

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