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AFNetworking 3.0无法下载图像

我正在尝试使用AFNetworking 3.0以这种方式下载图像:

- (UIImage *) loadImage:(NSString *) link
 {
    __block UIImage *image = [UIImage imageNamed:@"no_user_profile_pic.png"];
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];
    manager.responseSerializer = [AFImageResponseSerializer serializer];
    [manager GET:[link stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLHostAllowedCharacterSet]]
      parameters:nil
        progress:nil
         success:^(NSURLSessionTask *task, id responseObject) {
             image = (UIImage *) responseObject;
         } failure:^(NSURLSessionTask *operation, NSError *error) {
             NSLog(@"Load Image error - %@", [error description]);
         }];
    return image;
}

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每次我收到此错误: