I am trying to map a 403 forbidden respone to a custom object. I registered a mapping with the response code as follows:

```
RKResponseDescriptor* tacResponseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:termsAndConditionMapping pathPattern:@"user" keyPath:nil statusCodes:[NSIndexSet indexSetWithIndex:403]];
[objectManager addResponseDescriptor:tacResponseDescriptor];

```

But when the `403` response is send from the server, I just get a '`Non-successful status code encountered: performing mapping with nil target object`' log from RestKit and the failure block is executed with the operation's `mappingResult` property being `nil`. What am I doing wrong here? I need to map one specific error case of a specific path to a specific object.

Best regards,
Michael