ios - 'NSInvalidArgumentException', reason: '-[UINavigationController setMed:]: unrecognized selector sent to instance 0x746dda0' -

i making app people health conditions manage medication. have created modal add medication works , saves new medication using core data.

i trying allow people edit medication after has been saved. trying send managed object of medication "fibromappmedseditviewcontroller" , assign information in viewdidload method of class.

i keep getting error:

'nsinvalidargumentexception', reason: '-[uinavigationcontroller setmed:]: unrecognized selector sent instance 0x746dda0'  

could tell me doing wrong?

relevant methods in fibromappmedslistviewcontroller.m

- (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath {   //selmed declared @ top of file nsmanagedobject *selmed;     selmed = [self.meds objectatindex:indexpath.row];     nslog(@"selected med: %@",[selmed valueforkey:@"name"] );     uistoryboardsegue *seguestring = [nsstring stringwithformat:@"%@",@"editmeds"];      nslog(@"%@",seguestring);      [self performseguewithidentifier:@"editmeds" sender:indexpath];  }  -(void) prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender{       nslog(@"%@",segue.destinationviewcontroller);      nslog(@"%@",[selmed valueforkey:@"name"] );      fibromappmedseditviewcontroller *dest = segue.destinationviewcontroller;     dest.med = selmed;   } 

the fibromappmedseditviewcontroller.h

#import <uikit/uikit.h>  @interface fibromappmedseditviewcontroller : uitableviewcontroller - (ibaction)savechanges:(id)sender; - (ibaction)deletebtnpressed:(id)sender; - (ibaction)dosagechanged:(id)sender; - (ibaction)maxdosagechanged:(id)sender; - (ibaction)cancel:(id)sender; - (ibaction)typechanged:(id)sender;  @property (weak, nonatomic) iboutlet uitextfield *tbname; @property (weak, nonatomic) iboutlet uitextfield *tbdose; @property (weak, nonatomic) iboutlet uitextfield *tbmaxdose; @property (weak, nonatomic) iboutlet uitextfield *tbtype; @property (weak, nonatomic) iboutlet uistepper *stepperdose; @property (weak, nonatomic) iboutlet uistepper *steppermaxdose; @property (weak, nonatomic) iboutlet uisegmentedcontrol *changemeasure; @property (strong, nonatomic) nsmanagedobject *med;  @end 

the fibromappmedseditviewcontroller.m - parts altered affect way controller loads

#import "fibromappmedseditviewcontroller.h" #import "fibromappappdelegate.h" #import <coredata/coredata.h>  @interface fibromappmedseditviewcontroller ()  @end  @implementation fibromappmedseditviewcontroller   @synthesize tbname; @synthesize tbdose; @synthesize tbmaxdose; @synthesize tbtype; @synthesize med; double dose; double maxdose;  - (void)viewdidload {     [super viewdidload];      tbname.text = [med valueforkey:@"name"];//name string in model     tbdose.text = [med valueforkey:@"dose"];//dose double in model     tbmaxdose.text = [med valueforkey:@"maxdose"];//maxdose double in model     tbtype.text = [med valueforkey:@"type"];//type string in model  } 

if need see else please ask.

also, using storyboards app.

it appears log, fibromappmedseditviewcontroller (which should start capital letter btw) embedded in navigation controller. need navigation controller's root view controller.

-(void) prepareforsegue:(uistoryboardsegue *)segue sender:(id)sender{     uinavigationcontroller *nav = segue.destinationviewcontroller;     fibromappmedseditviewcontroller *dest = (fibromappmedseditviewcontroller *)nav.topviewcontroller;     dest.med = selmed; }