ios - NSBatchUpdateRequest throwing NSInternalInconsistencyException -

i keep getting following error when trying perform nsbatchupdaterequest.

*** terminating app due uncaught exception   'nsinternalinconsistencyexception', reason: 'unknown command type   <nsbatchupdaterequest : entity = person, properties = {     "(<nsattributedescription: 0x6000000ff980>), name title, isoptional 1, istransient 0, entity (null), renamingidentifier title, validation predicates (\n), warnings (\n), versionhashmodifier (null)\n userinfo {\n}, attributetype 700 , attributevalueclassname nsstring, defaultvalue (null)" = "\"sometitle\""; }, subentities = 1' 

the error log shows "entity (null)", when correctly specified in constructor.

i running test environment , wonder if nsbatchupdaterequest supports nspersistentstorecoordinator nsinmemorystoretype. cant find in docs not supported.

below code using. entity , property parameters correct , shouldn't causing issue.

-(bool) updatepersonnamesfrom:(nsstring*)oldname newname:(nsstring*)newname {      nsbatchupdaterequest* updaterequest = [[nsbatchupdaterequest alloc] initwithentityname:@"person"]; // person model exists      nslog(@"entity name: %@", updaterequest.entityname); // logs correct entity name      // adding or removing predicate has no effect     // [updaterequest setpredicate:[nspredicate predicatewithformat:@"name = %@", oldname];      updaterequest.propertiestoupdate = @{@"name" : newname}; // name field exists on person      nserror* error = nil;      [m_context executerequest:updaterequest error:&error];      // tried     // [m_context.persistentstorecoordinator executerequest:updaterequest withcontext:self error:&error];      return error != nil; } 

if has ideas love hear it.

from guide:

important: batch updates available when using sqlite persistent store.

sorry. maybe it'll work in ios 11. ¯\_(ツ)_/¯