ios - nil is not a legal NSPersistentStoreCoordinator for searching for entity name 'GroupMessageInfo' -

error message:

persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? persistentstorecoordinator nil ?? ------------ persistentstorecoordinator nil ?? 

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- (void)updategrouptablestatus:(tmpgroupmessageinfo*)info {   nsmanagedobjectcontext *ctx = [self createprivateobjectcontext];  [ctx performblock:^{     nspredicate *cdt = [nspredicate predicatewithformat:@"groupid == %@ && tableid == %@", info.groupid, info.tableid];      nsfetchrequest *fetchrequest = [groupmessageinfo makerequest:ctx predicate:cdt orderby:nil offset:0 limit:1];     nsarray *array = [ctx executefetchrequest:fetchrequest error:nil];     if ([array count] > 0) {         (groupmessageinfo *msg in array) {             msg.lastingtime = [nsnumber numberwithlonglong:0];         }         [ctx save:nil];         [self.managedobjectcontext performblock:^{             [self.managedobjectcontext save:nil];         }];     } }]; } 

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+ (nsfetchrequest*)makerequest:(nsmanagedobjectcontext*)ctx predicate:(nspredicate*)predicate orderby:(nsarray*)orders offset:(int)offset limit:(int)limit { nsstring *classname = [nsstring stringwithutf8string:object_getclassname(self)]; nsfetchrequest *fetchrequest = [[nsfetchrequest alloc] init]; [fetchrequest setentity:[nsentitydescription entityforname:classname inmanagedobjectcontext:ctx]]; if (predicate) {     [fetchrequest setpredicate:predicate]; } if (orders!=nil) {     [fetchrequest setsortdescriptors:orders]; } if (offset>0) {     [fetchrequest setfetchoffset:offset]; } if (limit>0) {     [fetchrequest setfetchlimit:limit]; } return fetchrequest;} 

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- (nsmanagedobjectcontext*)createprivateobjectcontext { if (_privatemanagedobjectcontext == nil) {     _privatemanagedobjectcontext = [[nsmanagedobjectcontext alloc] initwithconcurrencytype:nsprivatequeueconcurrencytype];     [_privatemanagedobjectcontext setparentcontext:self.managedobjectcontext]; }  return _privatemanagedobjectcontext;   } 

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- (nsmanagedobjectcontext *)managedobjectcontext {     if (_managedobjectcontext != nil) {         return _managedobjectcontext;     }      nspersistentstorecoordinator *coordinator = [self persistentstorecoordinator];     if (coordinator != nil) {         _managedobjectcontext = [[nsmanagedobjectcontext alloc] initwithconcurrencytype:nsmainqueueconcurrencytype];         [_managedobjectcontext setpersistentstorecoordinator:coordinator];     }     return _managedobjectcontext; }  // returns managed object model application. // if model doesn't exist, created application's model. - (nsmanagedobjectmodel *)managedobjectmodel {     if (_managedobjectmodel != nil) {         return _managedobjectmodel;     }     nsurl *modelurl = [[nsbundle mainbundle] urlforresource:@"pokerskymodel" withextension:@"momd"];     _managedobjectmodel = [[nsmanagedobjectmodel alloc] initwithcontentsofurl:modelurl];     return _managedobjectmodel; }  // returns persistent store coordinator application. // if coordinator doesn't exist, created , application's store added it. - (nspersistentstorecoordinator *)persistentstorecoordinator {     if (_persistentstorecoordinator != nil) {         return _persistentstorecoordinator;     }      ......      _persistentstorecoordinator = [[nspersistentstorecoordinator alloc] initwithmanagedobjectmodel:[self managedobjectmodel]];     if (![_persistentstorecoordinator addpersistentstorewithtype:nssqlitestoretype configuration:nil url:storeurl options:optionsdictionary error:&error]) {         nslog(@"unresolved error %@, %@", error, [error userinfo]);         [self cleandata];         abort();     }     return _persistentstorecoordinator; } 

i came cross same crash yours. found out initialize persistentstorecoordinator of nsmanagedobjectcontext cannot placed in background thread!

in case, coredata operation @ no.11 thread not main thread.if first time access coredata, persistentstorecoordinator set @ no.11 background thread lead crash. can reproduce crash putting these code appdidfinishlaunch @ appdelegate

 - (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {     dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{          // coredata operation here     }     // ... } 

the solution quite easy, ensure initialization of coredata(or first time use it) should @ main thread.when it's not, using gcd switch it

dispatch_async(dispatch_get_main_queue(), 0), ^{      // coredata initialize here }