Give Error 'mach_msg_trap' error - iphone

Question

when run the following code it give proper result but when go to another view and go back an further search it give the 'mach_msg_trap' error
- (void)viewWillAppear:(BOOL)animated {
AppDeleget= [[UIApplication sharedApplication] delegate];
ProcessView *Process=[[ProcessView alloc] init];
[Process SearchProperty:AppDeleget.PropertyURL page:AppDeleget.Page];
[Process release];
for(NSDictionary *status in AppDeleget.statuses)
{
NSMutableString *pic_string = [[NSMutableString alloc] initWithFormat:#"%#",[status objectForKey:#"picture"]];
if([pic_string isEqualToString:#""])
{
[ListPhotos addObject:#"NA"];
}
else
{
NSString *str= [[[status objectForKey:#"picture"] valueForKey:#"url"] objectAtIndex:0];
[ListPhotos addObject:str];
[str release];
}
}
[NSThread detachNewThreadSelector:#selector(LoadImage) toTarget:self withObject:nil];
[AppDeleget.MyProgressView stopAnimating];
[AppDeleget.Progress removeFromSuperview];
[super viewWillAppear:animated];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
TableCell *cell = (TableCell *)[TableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[TableCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
// NSString *bedsbaths=[NSString stringWithFormat:#"Beds:%# Baths:%#",[[AppDeleget.statuses valueForKey:#"beds"] objectAtIndex:indexPath.row],[[AppDeleget.statuses valueForKey:#"baths"] objectAtIndex:indexPath.row]];
cell.mlsno.text=[[AppDeleget.statuses valueForKey:#"mlsno"] objectAtIndex:indexPath.row];
cell.price.text=[[AppDeleget.statuses valueForKey:#"price"] objectAtIndex:indexPath.row];
cell.address.text=[[AppDeleget.statuses valueForKey:#"address"] objectAtIndex:indexPath.row];
// cell.bedsbaths.text=bedsbaths;
cell.bedsbaths.text=[[AppDeleget.statuses valueForKey:#"dispDetails"] objectAtIndex:indexPath.row];
cell.accessoryType=UITableViewCellAccessoryDetailDisclosureButton;
return cell;
}
-(void)LoadImage
{
for(int x=0;x<[ListPhotos count];x++)
{
if ([ListPhotos objectAtIndex:x] == #"NA")
{
UIImage *img = [UIImage imageNamed:#"No_image.png"];
[self performSelectorOnMainThread:#selector(downloadDone:) withObject:img waitUntilDone:NO];
}
else
{
NSData *imageData =[ListPhotos objectAtIndex:x];
id path = imageData;
NSURL *url = [NSURL URLWithString:path];
NSLog(#"%#",url);
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *img = [[UIImage alloc] initWithData:data];
[self performSelectorOnMainThread:#selector(downloadDone:) withObject:img waitUntilDone:NO];
}
}
}
-(void)downloadDone:(UIImage*)img {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:count inSection:0];
if(img == nil)
{
TableCell *cell = (TableCell *)[TableView cellForRowAtIndexPath:indexPath];
cell.myImageView.image=[UIImage imageNamed:#"No_image.png"];
++count;
[TableView reloadData];
}
else
{
TableCell *cell = (TableCell *)[TableView cellForRowAtIndexPath:indexPath];
cell.myImageView.image=img;
++count;
[TableView reloadData];
}
}

Answer 1

You're releasing objects which were not allocated:
NSString *str= [[[status objectForKey:#"picture"] valueForKey:#"url"] objectAtIndex:0];
[ListPhotos addObject:str];
[str release];
Here, 'str' shouldn't be released, because it's an autoreleased object.