ios - [__NSCFArray objectForKey:]: unrecognized selector sent to instance when fetching from Core Data -

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i getting error [__nscfarray objectforkey:]: unrecognized selector sent instance when trying fetch data core data.

i relatively new ios programming , don't quite understand error trying tell me. set exception breakpoint figure out line giving me problem , line of code:

if let fetchresults = managedobjectcontext!.executefetchrequest(fetchrequest, error: nil) as? [user] {

why getting error , how resolve it? related way save core data? did change receive json server, process in background , save changes managedobjectcontext in main thread.

func getuser(userid: string) -> user? {     let fetchrequest = nsfetchrequest(entityname: "user")     fetchrequest.predicate = nspredicate(format: "userid == %@", userid)     fetchrequest.fetchlimit = 1      if let fetchresults = managedobjectcontext!.executefetchrequest(fetchrequest, error: nil) as? [user] {         if !fetchresults.isempty {             return fetchresults[0]         }         else {             println("userid \(userid) not in database")         }     }     return nil }

error

2014-12-06 13:09:36.087 lfdate[3162:51570] -[__nscfarray objectforkey:]: unrecognized selector sent instance 0x7fb9e95c4310 2014-12-06 13:09:36.090 lfdate[3162:51570] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nscfarray objectforkey:]: unrecognized selector sent instance 0x7fb9e95c4310' *** first throw call stack: (     0   corefoundation                      0x00000001025c2f35 __exceptionpreprocess + 165     1   libobjc.a.dylib                     0x000000010465ebb7 objc_exception_throw + 45     2   corefoundation                      0x00000001025ca04d -[nsobject(nsobject) doesnotrecognizeselector:] + 205     3   corefoundation                      0x000000010252227c ___forwarding___ + 988     4   corefoundation                      0x0000000102521e18 _cf_forwarding_prep_0 + 120     5   corefoundation                      0x000000010248beaf cfdictionarygetvalue + 159     6   foundation                          0x0000000102befd78 -[nskeyedunarchiver initforreadingwithdata:] + 1698     7   foundation                          0x0000000102c135ea +[nskeyedunarchiver unarchiveobjectwithdata:] + 66     8   coredata                            0x000000010210b4e0 _prepareresultsfromresultset + 3552     9   coredata                            0x0000000102108930 newfetchedrowsforfetchplan_mt + 3296     10  coredata                            0x00000001020f53ac -[nssqlcore objectsforfetchrequest:incontext:] + 524     11  coredata                            0x00000001020f4e2b -[nssqlcore executerequest:withcontext:error:] + 299     12  coredata                            0x00000001021ca4f3 __65-[nspersistentstorecoordinator executerequest:withcontext:error:]_block_invoke + 3331     13  coredata                            0x00000001021d27ee gutsofblocktonspersistentstorecoordinatorperform + 190     14  libdispatch.dylib                   0x00000001052117f4 _dispatch_client_callout + 8     15  libdispatch.dylib                   0x00000001051f8774 _dispatch_barrier_sync_f_invoke + 365     16  coredata                            0x00000001021c53d5 _perform + 197     17  coredata                            0x00000001020f4ac8 -[nspersistentstorecoordinator executerequest:withcontext:error:] + 504     18  coredata                            0x00000001020f33e0 -[nsmanagedobjectcontext executefetchrequest:error:] + 544     19  lfdate                              0x0000000101b9c3b3 _tfc6lfdate14databasehelper7getuserfs0_fssgsqcs_4user_ + 1075     20  lfdate                              0x0000000101c4ce01 _tfc6lfdate23menutableviewcontroller9tableviewfs0_ftcso11uitableview21cellforrowatindexpathcso11nsindexpath_cso15uitableviewcell + 4689     21  lfdate                              0x0000000101c4e4ff _ttofc6lfdate23menutableviewcontroller9tableviewfs0_ftcso11uitableview21cellforrowatindexpathcso11nsindexpath_cso15uitableviewcell + 79     22  uikit                               0x000000010349d4b3 -[uitableview _createpreparedcellforglobalrow:withindexpath:willdisplay:] + 508     23  uikit                               0x000000010347cfb1 -[uitableview _updatevisiblecellsnow:isrecursive:] + 2846     24  uikit                               0x0000000103492e3c -[uitableview layoutsubviews] + 213     25  uikit                               0x000000010341f973 -[uiview(calayerdelegate) layoutsublayersoflayer:] + 521     26  quartzcore                          0x000000010318ade8 -[calayer layoutsublayers] + 150     27  quartzcore                          0x000000010317fa0e _zn2ca5layer16layout_if_neededepns_11transactione + 380     28  quartzcore                          0x000000010317f87e _zn2ca5layer28layout_and_display_if_neededepns_11transactione + 24     29  quartzcore                          0x00000001030ed63e _zn2ca7context18commit_transactionepns_11transactione + 242     30  quartzcore                          0x00000001030ee74a _zn2ca11transaction6commitev + 390     31  quartzcore                          0x00000001030eedb5 _zn2ca11transaction17observer_callbackep19__cfrunloopobservermpv + 89     32  corefoundation                      0x00000001024f7dc7 __cfrunloop_is_calling_out_to_an_observer_callback_function__ + 23     33  corefoundation                      0x00000001024f7d20 __cfrunloopdoobservers + 368     34  corefoundation                      0x00000001024edb53 __cfrunlooprun + 1123     35  corefoundation                      0x00000001024ed486 cfrunlooprunspecific + 470     36  graphicsservices                    0x00000001072f09f0 gseventrunmodal + 161     37  uikit                               0x00000001033a6420 uiapplicationmain + 1282     38  lfdate                              0x0000000101be33ae top_level_code + 78     39  lfdate                              0x0000000101be33ea main + 42     40  libdyld.dylib                       0x0000000105246145 start + 1     41  ???                                 0x0000000000000001 0x0 + 1 ) libc++abi.dylib: terminating uncaught exception of type nsexception


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