objective c - "unrecognized selector" on "Save" button? -

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could me understand error? project modalcontroller appears , let user save new text in mutablearray.
receive error debugger :

2011-07-21 16:53:52.362 aeffa[18089:207] -[__nsarrayi addobject:]: unrecognized selector sent instance 0x4b042d0

i checked code can't see what's wrong : "cancel" button works fine, "save" button launches error. here's code :

            - (void)viewdidload {                 [super viewdidload];          self.navigationitem.leftbarbuttonitem = [[[uibarbuttonitem alloc]                                                          initwithbarbuttonsystemitem:uibarbuttonsystemitemcancel                                                          target:self                                                          action:@selector(cancel:)] autorelease];         self.navigationitem.rightbarbuttonitem = [[[uibarbuttonitem alloc]                                                             initwithbarbuttonsystemitem:uibarbuttonsystemitemsave                                                             target:self                                                             action:@selector(save:)] autorelease];              }

and methods : 

            - (ibaction)cancel:(id)sender {                 [self dismissmodalviewcontrolleranimated:yes];             }              - (ibaction) save:(id)sender{                 website *newsite = [[website alloc]init];                 nsurl *newurl = [[nsurl alloc ]initwithstring:url.text];                  newsite.websiteurl = newurl;                 newsite.websitetitle = titre.text;                 newsite.websitedesc = descr.text;                  [tabwebsites addobject:newsite];                 [newurl release];                 [newsite release];             }

thanks

paul

i believe tabwebsites nsarray object.. doesn't have addobject: method. make sure it's nsmutablearray (you allocate nsarray, if might declared nsmutablearray).


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