objective c - UitableView Search Text Sigbart Error - ios -

i've implemented search bar (and display controller) in uitableview using code outlined below. when type in search text box following sigabrt error:

terminating app due uncaught exception 'nsunknownkeyexception', reason: '[ valueforundefinedkey:]: class not key value coding-compliant key name.'

i've re-reviewed tutorial i've been following , quadruple checked code cant find cause of error, can help?

- (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section {     if (tableview == self.searchdisplaycontroller.searchresultstableview) {         return [self.searchresults count];     } else {         return _restaurantsincity.count;     } }  - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     static nsstring *cellidentifier = @"restaurantcell";     uitableviewcell *cell = [_tableview dequeuereusablecellwithidentifier:cellidentifier];      if (cell == nil) {         cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstylesubtitle reuseidentifier:cellidentifier];         cell.accessorytype = uitableviewcellaccessorydisclosureindicator;     }      restarauntentity *currentrestaurant = nil;     if (tableview == self.searchdisplaycontroller.searchresultstableview) {         currentrestaurant = [[self.searchresults objectatindex:indexpath.row]];     } else {         currentrestaurant = [self.restaurantsincity objectatindex:indexpath.row];     }      nsstring *decodedtext1 = [currentrestaurant.title stringbyreplacingoccurrencesofstring:@"’" withstring:@"'"];     nsstring *decodedtext = [decodedtext1 stringbyreplacingoccurrencesofstring:@"&" withstring:@"&"];     cell.textlabel.text = decodedtext;     cell.textlabel.font = [uifont fontwithname:@"avenir" size:16.0f];     cell.textlabel.textcolor=[uicolor blackcolor];     cell.detailtextlabel.text = currentrestaurant.city;     cell.detailtextlabel.font = [uifont fontwithname:@"avenir" size:12.0f];     cell.detailtextlabel.textcolor=[uicolor darkgraycolor];      return cell; }  - (void)filtercontentforsearchtext:(nsstring*)searchtext scope:(nsstring*)scope {     nspredicate *resultpredicate = [nspredicate predicatewithformat:@"name contains[cd] %@", searchtext];     searchresults = [_restaurantsincity filteredarrayusingpredicate:resultpredicate]; }  -(bool)searchdisplaycontroller:(uisearchdisplaycontroller *)controller shouldreloadtableforsearchstring:(nsstring *)searchstring {     [self filtercontentforsearchtext:searchstring                                scope:[[self.searchdisplaycontroller.searchbar scopebuttontitles]                                       objectatindex:[self.searchdisplaycontroller.searchbar                                                      selectedscopebuttonindex]]];      return yes; } 

try

it happens if have created outlet or action on button does't exists more. check actions , outlets. go storyboard , right click on yellow sign of viewcontroller , delete actions , outlets yellow sign.

hope helps.

libc++abi.dylib: terminating uncaught exception of type nsexception (lldb)

try answer hope helps.