edit tableView and delete Document file - iphone

Question

i've a tabBarController with 4 viewController.
One of this is a TableViewController.
In viewDidLoad of the tableView i inizialize 2 NSMutableArray
list = [[NSMutalbeArray alloc] init];
dates = [[NSMutalbeArray alloc] init];
in viewDidAppear i add objects
NSError *error;
NSError *error1;
fileManager = [NSFileManager defaultManager];
paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
docsPath = [paths objectAtIndex:0];
for (NSString *file in [fileManager contentsOfDirectoryAtPath:docsPath error:&error]) {
fileFrom = [docsPath stringByAppendingPathComponent:file];
NSDictionary* properties = [[NSFileManager defaultManager]
attributesOfItemAtPath:fileFrom
error:&error1];
NSDate* modDate = [properties objectForKey:NSFileModificationDate];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setLocale: [NSLocale currentLocale]];
[dateFormatter setDateStyle:kCFDateFormatterMediumStyle];
[dateFormatter setTimeStyle:kCFDateFormatterNoStyle];
NSString* dateString = [dateFormatter stringFromDate:modDate];
BOOL isDir;
BOOL exists = [[NSFileManager defaultManager] fileExistsAtPath:[NSString stringWithFormat:#"%#/%#", docsPath, file] isDirectory:&isDir];
if (exists && !isDir && ![file hasPrefix:#"."]) {
[list addObject:file];
[dates addObject:dateString];
}
}
[[self tableView] reloadData];
where every file is a filename in my documentDirectory and dateString the creation date.
I can visualize in my tableView the list of file.
If i edit the tableView and try to delete element it works, i can remove the element both from filesystem and on the tableView BUT if i add a new file to my document directory (like the apps do) i receive an EXE_BAD_ADDRESS
- (void)tableView:(UITableView *)tableView commitEditingStyle: (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
NSString *temp = [list objectAtIndex:indexPath.row];
NSString *lastPath = [docsPath stringByAppendingPathComponent:temp];
[fileManager removeItemAtPath:lastPath error:nil];
[self.list removeObjectAtIndex:indexPath.row];
[self.dates removeObjectAtIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:YES];
[self.tableView reloadData];
}
}
Any advise?