ios - Objective C error [__NSCFNumber length]: unrecognized selector sent to instance -

i m writing tableview based application. works when use default cells in tableview. when try make customs cells have error :

2014-12-01 22:50:01.690 signaturegourmande[15701:624637] -[__nscfnumber length]: unrecognized selector sent instance 0xb0000000000000c3 2014-12-01 22:50:01.716 signaturegourmande[15701:624637] *** terminating app due uncaught exception 'nsinvalidargumentexception', reason: '-[__nscfnumber length]: unrecognized selector sent instance 0xb0000000000000c3' 

the application works when have code :

static nsstring *simpletableidentifier = @"simpletableitem";     uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:simpletableidentifier];      if (cell == nil) {         cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:simpletableidentifier];     }      cell.textlabel.text = [nomdata objectatindex:indexpath.row];     return cell; 

i have error when replace code :

static nsstring *simpletableidentifier = @"produitcell";     produitcell *cell = (produitcell *)[tableview dequeuereusablecellwithidentifier:simpletableidentifier];     if (cell == nil)     {         nsarray *nib = [[nsbundle mainbundle] loadnibnamed:@"produitcell" owner:self options:nil];         cell = [nib objectatindex:0];     }      cell.namelabel.text = [nomdata objectatindex:indexpath.row];     cell.thumbnailimageview.image = [uiimage imagenamed:[urldata objectatindex:indexpath.row]];     cell.pricelabel.text = [prixdata objectatindex:indexpath.row];      return cell; 

i have created class "produitcell" ".h" , ".m", have 3 property in .h file. have linked these property in storyboard right cells items in xib.

thanks help.

check below line, if nsnumber class type change below using stringvalue:-

cell.pricelabel.text = [[prixdata objectatindex:indexpath.row]stringvalue];