使用AFN时3840错误的解决

 1     //创建管理者
 2    AFHTTPRequestOperationManager *manger=[AFHTTPRequestOperationManager manager];
 3     manger.responseSerializer.acceptableContentTypes=[NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript",@"text/html",nil];

 4     manger.requestSerializer = [AFHTTPRequestSerializer serializer];
 5     manger.responseSerializer = [AFHTTPResponseSerializer serializer];
 6     NSString *url=[NSString stringWithFormat:@"*********phoneNumber=%@&pwd=%@",self.phoneNumTF.text,self.secretTF.text];
 7 
 8     NSLog(@"%@",url);
 9     
10     [manger GET:url parameters:nil success:^(AFHTTPRequestOperation * _Nonnull operation, id  _Nonnull responseObject) {
11         
12         NSLog(@"responseObject###########%@",[responseObject class]);
13         NSLog(@"#######responseObject########");
14      
16     } failure:^(AFHTTPRequestOperation * _Nullable operation, NSError * _Nonnull error) {
17         
18         NSLog(@"%@",error);
19         NSLog(@"######error######");
20 
21     }];

之前就是因为没写第3，4，5条，所以一直报错。
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