Как решить ошибку :NSURLConnectionInternalConnection _withConnectionDisconnectFromConnection

в моем приложении я загружаю на диск огромный (200 МБ+ )файл.
после завершения загрузки я получаю эту ошибку:

[NSURLConnectionInternalConnection _withConnectionDisconnectFromConnection]:  
message sent to deallocated instance 0x8cb0b40  

я пытаюсь вызвать информацию malloc -историю 0x8cb0b40 , но я получаю

Undefined info command: "malloc-history 0x8cb0b40".  Try "help info".  

я использую(гдб)но все еще получаю эту информацию. я не могу найти ошибку здесь.

Как я могу решить эту проблему?

вот мой код (Методы NSURL):

#pragma mark - NSURL methods


- (void)loadingProgress:(NSNumber *)nProgress {
[self.progressView setProgress:[nProgress floatValue]];
}


- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
XLog(@"");

[self.receivedData setLength:0];
XLog(@"response: %@", [response description]);


self.path = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0] stringByAppendingPathComponent:@"vox.zip"];
[[NSFileManager defaultManager] createFileAtPath:self.path contents:nil attributes:nil];
self.file = [[NSFileHandle fileHandleForUpdatingAtPath:self.path] retain];// Here file is object of NSFileHandle and its declare in.h File

[self.file seekToEndOfFile];


if ([response isKindOfClass:[NSHTTPURLResponse self]]) {
    NSDictionary *headers = [(NSHTTPURLResponse *)response allHeaderFields];
    lengthOfXMLContent = [[headers objectForKey:@"Content-Length"] intValue];
    XLog(@"session: %@", [headers objectForKey:@"Set-Cookie"]);

    [self.prefs setValue:[headers objectForKey:@"Set-Cookie"] forKey:@"keySession"];

    XLog(@"headers: %@", headers);
    XLog(@"Incoming length: %i", lengthOfXMLContent);

}
}


- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {

//XLog(@"didReceiveData entered");

self.dataCount = self.dataCount + [data length];

if (self.receivedData) {

    self.paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    self.documentsDirectory = [self.paths objectAtIndex:0];


    self.responseString = [[[NSString alloc] initWithData:self.receivedData encoding:NSUTF8StringEncoding] autorelease];

}

XLog(@"------------------------------------------: %d", lengthOfXMLContent);


double progress = (double)self.dataCount / (double)lengthOfXMLContent;


XLog(@"--------------: %i", self.dataCount);
XLog(@"--------------: %d", lengthOfXMLContent);
XLog(@"--------------: ");
XLog(@"--------------: %f \n", progress);


[self.file seekToEndOfFile];
[self.file writeData:data];
//XLog(@"data--------------: %i", [data length]);

[self performSelectorInBackground:@selector(loadingProgress:) withObject:[NSNumber numberWithFloat:progress]];
}


- (void) connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
XLog(@"");
XLog(@"error: %@", error);


self.receivedData = nil;
self.progressView.progress = 0.00;
lengthOfXMLContent = 0;
//recievedData = NO;

UIAlertView *alertCanceled = [[UIAlertView alloc] initWithTitle:@"Verbindungsfehler" message:@"Verbindung wurde unterbrochen. \nPruefen Sie Ihre Verbindung und versuchen Sie es noch einmal." delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alertCanceled show];
[alertCanceled release];

viewDownload.hidden = YES;

//[self removeActivityViewer];
[connection release];
[self.file closeFile];
}


- (void) connectionDidFinishLoading:(NSURLConnection *)connection {
XLog(@"");


[self.file closeFile];
//NSError *error = nil;
XLog(@"Succeeded! Received %d bytes of data", [self.receivedData length]);


[connection release];

//self.lblInfo.text = @"Datei wurde heruntergeladen.\nDatei wird entpackt, bitte Warten..";
self.progressView.hidden = YES;
self.btnDownloadVOX_DE.hidden = YES;
self.btnDownloadVOX_EN.hidden = YES;


[UIApplication sharedApplication].networkActivityIndicatorVisible = NO;




ZipArchive *za = [[[ZipArchive alloc] init] autorelease];
[za UnzipOpenFile:[NSString stringWithFormat:@"%@/vox.zip", self.documentsDirectory]];
[za UnzipFileTo:self.documentsDirectory overWrite:YES];


viewDownload.hidden = YES;

}