AFNetworking upload PDF file

Question

I'm trying to upload a pdf file with AFNetworking 3.0 to a server,

My pdf file was send in NSData in the formData but it's returning me this error :

NSError * domain: @"com.alamofire.error.serialization.response" - code: 18446744073709550605

There my code :

-(void)uploadPDFFile{


    NSMutableURLRequest *request = [[AFHTTPRequestSerializer serializer] multipartFormRequestWithMethod:@"POST" URLString:@"URLREQUEST" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        [formData appendPartWithFileData:self->originalDataPDF name:@"fileName" fileName:self->fileNamePDF mimeType:@"application/pdf"];
        
       
        }
        error:nil];

    AFURLSessionManager *manager = [[AFURLSessionManager alloc] 
    initWithSessionConfiguration:[NSURLSessionConfiguration 
    defaultSessionConfiguration]];
    
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
  

    NSURLSessionUploadTask *uploadTask;
        uploadTask = [manager uploadTaskWithStreamedRequest:request
  progress:^(NSProgress * _Nonnull uploadProgress) {
      // This is not called back on the main queue.
      // You are responsible for dispatching to the main queue for UI updates
      
  }
  completionHandler:^(NSURLResponse * _Nonnull response, id  _Nullable responseObject, NSError * _Nullable error) {
  if (error) {
          NSLog(@"%@",[[NSString alloc]initWithData:responseObject encoding:NSUTF8StringEncoding]);    
      } else {

               NSLog(@"WORKING ");

             }
      }];

    [uploadTask resume];
}

When print the responseObject the error Log return me this :

406 Not Acceptable

Not Acceptable

An appropriate representation of the requested resource could not be found on this server.

Additionally, a 406 Not Acceptable error was encountered while trying to use an ErrorDocument to handle the request.

Thanks for your help