xcode - iOS application tried to push a nil view controller on target <UINavigationController: -

xmpp using tableview trying go next view controller particular username. have implemented uitablevie's didselectrowatindexpath correctly. when click on username gives error this.

application tried push nil view controller on target.

"<"uinavigationcontroller: 0x7fe831dac0d0>. 2015-06-04 14:22:51.063

i have declared storyboard in appdelegate.m this.

 - (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {       chatviewcontroller *chatviewcontroller1 = [[chatviewcontroller alloc]init]; self.storyboard = [uistoryboard storyboardwithname:@"main" bundle:nil];   return yes; } 

and here tableview's delegate method.

 - (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath  { [self.tblvwbuddy deselectrowatindexpath:indexpath animated:yes]; xmppusercoredatastorageobject *user = nil; user = [[self fetchedresultscontroller] objectatindexpath:indexpath];  chathistryviewcontroller *chathistory1 = [[chathistryviewcontroller alloc] init]; // or initwith... chathistory1 = [appdelegate.storyboard instantiateviewcontrollerwithidentifier:@"chathistryviewcontroller"];//my next view controller's name      chathistory1.chatuserobject = user;        chathistory1.hidesbottombarwhenpushed = yes;  chathistory1.self.tabbarcontroller.navigationitem.title = user.displayname;  [self.tabbarcontroller.navigationcontroller pushviewcontroller:chathistory1 animated:yes];  } 

what missing in ? or wrong?

try this:

 uitabbarcontroller *vc = [self.storyboard instantiateviewcontrollerwithidentifier:@"main"];         nsarray *listviewcontroller=vc.viewcontrollers;         vc.selectedviewcontroller=[listviewcontroller objectatindex:1];         [self presentviewcontroller:vc animated:yes completion:nil]; 

ps.... listviewcontroller objectatindex: 1 <--- indicates position want show viewcontroller