objective c - RestKit - Not key value coding-compliant -

i have managed object myentity use without problem throughout application.

@interface myentity : nsmanagedobject  @property (nonatomic, retain) nsstring *code; @property (nonatomic, retain) nsnumber *def_value; @property (nonatomic, retain) nsstring *label; @property (nonatomic, retain) nsstring *link_label; @property (nonatomic, retain) nsnumber *order;  @end 

i have web service http://my_server/myentity returns me:

[     {         code: "type",         label: "administrative",         order: "3",         def_value: "0",         link_label: ""     },     {         code: "topic",         label: "ndf",         order: "1",         def_value: "0",         link_label: "administrative"     },     {         code: "topic",         label: "report",         order: "2",         def_value: "1",         link_label: "administrative"     },     {         code: "topic",         label: "other",         order: "3",         def_value: "0",         link_label: "administrative"     }, ... ] 

i'm trying map , fetch list

nsurl *baseurl = [nsurl urlwithstring: @"http://my_server"]; nsstring *objname = @"myentity"; nsmanagedobjectmodel *managedobjectmodel = [nsmanagedobjectmodel mergedmodelfrombundles:nil]; rkmanagedobjectstore *managedobjectstore = [[rkmanagedobjectstore alloc] initwithmanagedobjectmodel:managedobjectmodel]; [rkmanagedobjectstore setdefaultstore:managedobjectstore]; [managedobjectstore createpersistentstorecoordinator];  rkobjectmanager *objectmanager = [rkobjectmanager managerwithbaseurl: baseurl]; rkentitymapping *objmap = [rkentitymapping mappingforentityforname:objname inmanagedobjectstore:managedobjectstore]; [objmap addattributemappingsfromdictionary: @{      @"code": @"code",      @"label": @"label",      @"order": @"order",      @"def_value": @"def_value",      @"link_label": @"link_label",  }];  rkresponsedescriptor *responsedescriptor = [rkresponsedescriptor responsedescriptorwithmapping:objmap pathpattern:nil keypath:nil statuscodes:rkstatuscodeindexsetforclass(rkstatuscodeclasssuccessful)];  [objectmanager addresponsedescriptor:responsedescriptor]; [objectmanager getobjectsatpath:objname parameters:nil success:^(rkobjectrequestoperation *operation, rkmappingresult *mappingresult) {     nslog(@"ok"); } failure:^(rkobjectrequestoperation *operation, nserror *error) {     nslog(@"ko"); }]; 

it's giving me error

i restkit.network:rkhttprequestoperation.m:185 get'http://my_server/myentity'(200 ok) coredata: error: failed call designated initializer on nsmanagedobject class 'myentity'
terminating app due uncaught exception 'nsunknownkeyexception', reason:
'[ valueforundefinedkey:]: entity (null) not key value coding-compliant key "link_label".'

i saw error on 2 or 3 questions each different problem , seem not of mine.

can me debug ?

you need configure objectmanager:

objectmanager.managedobjectstore = managedobjectstore; 

you aren't completing core data stack initialisation:

[managedobjectstore createmanagedobjectcontexts];