problem with loading the dataset

hi, I am having problem with loading the dataset... I download the dataset from url and write it to the Documents Dir as follows: the xml file, [CODE]NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES); NSString *documentsDir = [paths objectAtIndex:0]; NSString *filePathxml = @"http://../../../tracker/tracker.xml"; NSData *dataxml = [NSData dataWithContentsOfURL:[NSURL URLWithString:filePathxml]]; [dataxml writeToFile:[NSString stringWithFormat:@"%@/tracker.xml",documentsDir] atomically:YES];[/CODE] and the dat file, here the trackerdat.xml is actually a tracker.dat file which is just renamed so that i can download it.. [CODE] NSString *filePathdat = @"http://../../../tracker/trackerdat.xml"; NSData *datadat = [NSData dataWithContentsOfURL:[NSURL URLWithString:filePathdat]]; [datadat writeToFile:[NSString stringWithFormat:@"%@/tracker.dat",documentsDir] atomically:YES];[/CODE] I can see both tracker.xml and tracker.dat file in organiser in doc dir. but while loading the dataset in the - (BOOL)loadDataSet:(NSString *)dataSetPath method it does no loads the dataset, giving... Failed to load data set. in here QCARutils: Failed to load target it was loading the dataset earlier when i had done the same thing... but now its just not loading the dataset which i download from server in docs dir.. please help..