ios - Error when assigning NSString variable in a block -

- 

    - (nsstring *) geocodeaddressfromcoordinate:(cllocationcoordinate2d)coordinate     {         cllocation *location = [[cllocation alloc]initwithlatitude:coordinate.latitude longitude:coordinate.longitude];         __block nsmutablestring * address = [nsmutablestring string];           geocoder = [[clgeocoder alloc]init];         [geocoder reversegeocodelocation:location completionhandler:^(nsarray *placemarks, nserror *error)           {              if (error) {                       nslog(@"%@", [error localizeddescription]);                  uialertview *alert = [[uialertview alloc]initwithtitle:@"no results found" message:@"try search" delegate:self cancelbuttontitle:@"cancel" otherbuttontitles:nil, nil];                  alert.show;                  return;              }              if ([placemarks count]>0)               {                     nslog([placemarks description]);                  clplacemark *placemark = [placemarks objectatindex:0];                  nslog(placemark.locality); //this line makes error                  [address initwithstring:placemark.locality];**              }          }];         return address;     }

got following runtime error:

* terminating app due uncaught exception 'nsinvalidargumentexception', reason: '* initialization method -initwithcharactersnocopy:length:freewhendone: cannot sent abstract object of class __nscfstring: create concrete instance!'

you should never call 'initwithstring:' without matching alloc. looks more want [address setstring:placemark.locality]


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