TBXML parsing issue while the value cannot get in UILabel [closed]

Question

In my app i'm using TBXML parser where i need to get a value from xml file and print it on the label...This is my xml file in server

 <gold>
 <price>
 <title>22 K Gold</title>
  </price>
  <price>
  <title>24 K Gold</title>
 </price>
   </gold>

any my Viewcontroller.h looks like

#import <UIKit/UIKit.h>
#import "TBXML.h"

 @interface ViewController : UIViewController{

 IBOutlet UILabel *lab;
 IBOutlet UILabel *lab1;
TBXML *tbxml;
  }



  @end

and my Viewcontrooler.m looks like

  - (void)viewDidLoad
  {
   [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
   NSData *xmlData = [[NSData alloc]initWithContentsOfURL:[NSURL  URLWithString:@"http://www.abcde.com/sample.xml"]];
 tbxml = [[TBXML alloc]initWithXMLData:xmlData];


  TBXMLElement * root = tbxml.rootXMLElement;

  if (root)
 {
TBXMLElement * elem_PLANT = [TBXML childElementNamed:@"price" parentElement:root];
while (elem_PLANT !=nil)
{
    TBXMLElement * elem_BOTANICAL = [TBXML childElementNamed:@"title" parentElement:elem_PLANT];
    NSString *botanicalName = [TBXML textForElement:elem_BOTANICAL];
    lab.text=[NSString stringWithFormat:@"re %@", botanicalName];

    elem_PLANT = [TBXML nextSiblingNamed:@"price" searchFromElement:elem_PLANT]; 

    elem_BOTANICAL = [TBXML childElementNamed:@"title" parentElement:elem_PLANT]; 

    botanicalName = [TBXML textForElement:elem_BOTANICAL];
    lab1.text=[NSString stringWithFormat:@"re %@", botanicalName];
}
 }

 }

i'm getting BAD_ACCESS thread.Am i missing anything...Help pls...