title: RESTKit: No mappable object representations were found at the key paths searched
body: <p>Log:</p>
  
  <pre><code>2014-04-09 15:03:10.196 App[49808:60b] request &lt;NSMutableURLRequest: 0xd091170&gt; { URL: http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z }
  2014-04-09 15:03:10.214 App[49808:60b] I restkit.network:RKObjectRequestOperation.m:180 GET 'http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z'
  2014-04-09 15:03:10.300 App[49808:632f] D restkit.object_mapping:RKMapperOperation.m:377 Executing mapping operation for representation: {
      meetups =     (
                  {
              activities =             (
                                  {
                      activityId = 37;
                      activityType = "&lt;null&gt;";
                      customData = "&lt;null&gt;";
                      locationAddress = "k2-LocationAddress";
                      locationName = "k2-LocationName";
                      startTime = "0000-00-00 00:00:00";
                  },
                                  {
                      activityId = 38;
                      activityType = "&lt;null&gt;";
                      customData = "&lt;null&gt;";
                      locationAddress = "k-LocationAddress";
                      locationName = "k-LocationName";
                      startTime = "0000-00-00 00:00:00";
                  }
              );
              comment = comment;
              gettingBack = "gettingBack Test";
              gettingThere = "gettingBack Test";
              meetingType = 1;
              meetupId = 65;
              modified = "2014-04-09T20:59:29.000Z";
              ownerId = Joe;
              recipientId = "&lt;null&gt;";
          }
      );
  }
   and targetObject: (null)
  2014-04-09 15:03:10.301 App[49808:632f] D restkit.object_mapping:RKMapperOperation.m:403 Finished performing object mapping. Results: (null)
  2014-04-09 15:03:10.302 App[49808:21f] E restkit.network:RKObjectRequestOperation.m:243 GET 'http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z' (200 OK / 0 objects) [request=0.0849s mapping=0.0000s total=0.1043s]: Error Domain=org.restkit.RestKit.ErrorDomain Code=1001 "No response descriptors match the response loaded." UserInfo=0xd0b5a40 {NSErrorFailingURLStringKey=http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z, NSLocalizedFailureReason=A 200 response was loaded from the URL 'http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z', which failed to match all (0) response descriptors:, NSLocalizedDescription=No response descriptors match the response loaded., keyPath=null, NSErrorFailingURLKey=http://www.domain.com/meetups?lastrequest=2014-04-09T15%3A03%3A10Z, NSUnderlyingError=0xd08a190 "No mappable object representations were found at the key paths searched."}
  </code></pre>
  
  <p>Code:</p>
  
  <pre><code>@property (strong, nonatomic) RKObjectManager *objectManager;
  ....
  
  AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
  self.objectManager = [self getObjectManager];
  
  self.objectManager.managedObjectStore = [appDelegate setupCoreDataWithRESTKit];
  
  [RKObjectManager sharedManager].requestSerializationMIMEType = RKMIMETypeJSON;
  
  RKEntityMapping *invitationMapping = [RKEntityMapping mappingForEntityForName:@"Invite" inManagedObjectStore:self.objectManager.managedObjectStore];
  [invitationMapping addAttributeMappingsFromDictionary:@{
                                                          @"recipientId" : @"recipientId",
                                                          @"meetingType" : @"meetingType",
                                                          @"startDate" : @"startDate",
                                                          @"gettingThere" : @"gettingThere",
                                                          @"gettingBack" : @"gettingBack",
                                                          @"comment" : @"comment"
                                                          }];
  invitationMapping.identificationAttributes = @[@"meetupId"];
  
  RKEntityMapping *activityMapping = [RKEntityMapping mappingForEntityForName:@"Activity" inManagedObjectStore:self.objectManager.managedObjectStore];
  [activityMapping addAttributeMappingsFromDictionary:@{
                                                        @"locationName" : @"locationName",
                                                        @"locationAddress" : @"locationAddress",
                                                        @"startTime" : @"startTime",
                                                        @"customData" : @"customData"
                                                        }];
  activityMapping.identificationAttributes = @[@"activityId"];
  NSIndexSet *statusCodeSet = RKStatusCodeIndexSetForClass(RKStatusCodeClassSuccessful);
  
  [invitationMapping addPropertyMapping:[RKRelationshipMapping relationshipMappingFromKeyPath:@"activities" toKeyPath:@"activities" withMapping:activityMapping]];
  
  
  RKResponseDescriptor *responseDescriptor = [RKResponseDescriptor responseDescriptorWithMapping:invitationMapping
                                                                                          method:RKRequestMethodGET
                                                                                     pathPattern:@"/meetups"
                                                                                         keyPath:@"meetups" statusCodes:statusCodeSet];
  
  
  NSMutableURLRequest *request = [self.objectManager.HTTPClient requestWithMethod:@"GET"
                                                                             path:@"/meetups"
                                                                       parameters:@{@"lastrequest": dateString
  
                                                                                    }];
  
   [self.objectManager.HTTPClient  registerHTTPOperationClass:[AFHTTPRequestOperation class]];
  
  RKManagedObjectRequestOperation *operation = [[RKManagedObjectRequestOperation alloc]initWithRequest:request responseDescriptors:@[responseDescriptor]];
  
  operation = [self.objectManager managedObjectRequestOperationWithRequest:request managedObjectContext:self.objectManager.managedObjectStore.mainQueueManagedObjectContext success:^(RKObjectRequestOperation *operation, RKMappingResult *mappingResult) {
      NSArray *array = mappingResult.array;
      NSLog(@"array %@", array);
  } failure:^(RKObjectRequestOperation *operation, NSError *error) {
  
  }];
  
  [operation start];
  }
  </code></pre>
  
  <p><code>Invite</code> has to-many relationship with <code>Activity</code> called <code>activities</code>.</p>
  
  <p>Why am I getting: "No mappable object representations were found at the key paths searched." ?</p>